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157-560: They were thought to be able to control and have power over time in various ways. They were sometimes seen as literally the "Past, Present, and Future". From the Taoist classic Tao Te Ching , it was held that "The Tao produced One; One produced Two; Two produced Three; Three produced All things." It is generally agreed by Taoist scholars that Tao produced One means Wuji produced Taiji , and One produced Two means Taiji produced Yin and Yang [or Liangyi ( 兩儀 ) in scholastic terms]. However,

314-675: A Chancellor of the Tang dynasty . With this victory, the Turks accepted Taizong as their khagan , a title rendered as Tian Kehan in addition to his rule as emperor of China under the traditional title " Son of Heaven ". Taizong was succeeded by his son Li Zhi (as Emperor Gaozong ) in 649. The Tang engaged in military campaigns against the Western Turks , exploiting the rivalry between Western and Eastern Turks in order to weaken both. Under Emperor Taizong , campaigns were dispatched in

471-529: A causal relation . General relativity does not address the nature of time for extremely small intervals where quantum mechanics holds. In quantum mechanics, time is treated as a universal and absolute parameter, differing from general relativity's notion of independent clocks. The problem of time consists of reconciling these two theories. As of 2024, there is no generally accepted theory of quantum general relativity. Generally speaking, methods of temporal measurement, or chronometry , take two distinct forms:

628-725: A differential gear was reproduced in several models for Tenji in 666, as recorded in the Nihon Shoki (720). Japanese monks also visited China; such was the case with Ennin (794–864), who wrote of his travel experiences including travels along the Grand Canal . The Japanese monk Enchin (814–891) stayed in China from 839 to 847, and again from 853 to 858, landing near Fuzhou , Fujian and setting sail for Japan from Taizhou, Zhejiang during his second trip to China. The Sui and Tang carried out successful military campaigns against

785-681: A "restored" Tang dynasty, the Later Tang , before toppling the Later Liang dynasty the same year. However, southern China remained splintered into various small kingdoms until most of China was reunified under the Song dynasty (960–1279). Control over parts of northeast China and Manchuria by the Liao dynasty of the Khitan people also stemmed from this period. In 905, their leader Abaoji formed

942-607: A Buddhist memorial service for the casualties of war; in 629, he had Buddhist monasteries erected at the sites of major battles so that monks could pray for the fallen on both sides of the fight. During the Tang campaign against the Eastern Turks , the Eastern Turkic Khaganate was destroyed after the capture of its ruler, Illig Qaghan by the famed Tang military officer Li Jing (571–649), who later became

1099-418: A broad variety of texts. The jinshi tested a student's literary abilities in writing essays in response to questions on governance and politics, as well as in composing poetry . Candidates were also judged on proper deportment, appearance, speech, and calligraphy , all subjective criteria that favoured the wealthy over those of more modest means who were unable to pay tutors of rhetoric and writing.Although

1256-617: A calendar based solely on twelve lunar months. Lunisolar calendars have a thirteenth month added to some years to make up for the difference between a full year (now known to be about 365.24 days) and a year of just twelve lunar months. The numbers twelve and thirteen came to feature prominently in many cultures, at least partly due to this relationship of months to years. Other early forms of calendars originated in Mesoamerica, particularly in ancient Mayan civilization. These calendars were religiously and astronomically based, with 18 months in

1413-620: A dimension. Isaac Newton said that we are merely occupying time, he also says that humans can only understand relative time . Relative time is a measurement of objects in motion. The anti-realists believed that time is merely a convenient intellectual concept for humans to understand events. This means that time was useless unless there were objects that it could interact with, this was called relational time . René Descartes , John Locke , and David Hume said that one's mind needs to acknowledge time, in order to understand what time is. Immanuel Kant believed that we can not know what something

1570-479: A disproportionate number of civil officials came from aristocratic families, wealth and noble status were not prerequisites, and the exams were open to all male subjects whose fathers were not of the artisan or merchant classes . To promote widespread Confucian education, the Tang government established state-run schools and issued standard versions of the Five Classics with commentaries. Open competition

1727-670: A divine object associated with their task. Yuánshǐ Tiānzūn is usually depicted holding the Pearl of Creation, signifying his role in recreating the Universe. The Ruyi held by Lingbao Tianzun represents authority: the second phase of Creation where the Yang was separated from the Yin and the Law of Things was ordered in place. Lingbao Tianzun then took his seat on the left of Yuanshi Tianzun. Later, when all

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1884-551: A golden age of economic prosperity and pleasant lifestyles within the imperial court. Xuanzong was seen as a progressive and benevolent ruler, having abolished the death penalty in 747. Previously, all executions had to be approved by the emperor; in 730, there were only 24 executions. Xuanzong bowed to the consensus of his ministers on policy decisions and made efforts to staff government ministries fairly with different political factions. His staunch Confucian chancellor Zhang Jiuling (673–740) worked to reduce deflation and increase

2041-403: A head in the famous Leibniz–Clarke correspondence . Philosophers in the 17th and 18th century questioned if time was real and absolute, or if it was an intellectual concept that humans use to understand and sequence events. These questions lead to realism vs anti-realism; the realists believed that time is a fundamental part of the universe, and be perceived by events happening in a sequence, in

2198-407: A hundred minutes of a hundred seconds, which marked a deviation from the base 12 ( duodecimal ) system used in many other devices by many cultures. The system was abolished in 1806. A large variety of devices have been invented to measure time. The study of these devices is called horology . An Egyptian device that dates to c.  1500 BC , similar in shape to a bent T-square , measured

2355-481: A major expansion of Taoism. Where the celestial masters had added the pure gods of the Tao to the popular pantheon, Shàngqīng enlarged this to include an entirely new layer of existence between the original, creative force of the Tao, represented by the deity "yuan shi tian wang" (heavenly king of primordial beginning), and created world as we know it. This celestial layer consisted of several different regions, located both in

2512-454: A major state". Even after the power of the central government was in decline after the mid-8th century, it was still able to function and give out imperial orders on a massive scale. The Old Book of Tang (945) recorded that a government decree issued in 828 standardised the use of square-pallet chain pumps for irrigation throughout the country. The last ambitious ruler of the Tang was Emperor Xianzong ( r.  805–820 ), whose reign

2669-755: A military alliance with Li Keyong against Zhu Wen but the Khitans eventually turned against the Later Tang, helping another Shatuo leader Shi Jingtang of Later Jin to overthrow Later Tang in 936. Taizong set out to solve internal problems within the government which had constantly plagued past dynasties. Building upon the Sui legal code, he issued a new legal code that subsequent Chinese dynasties would model theirs upon, as well as neighbouring polities in Vietnam , Korea , and Japan . The earliest law code to survive

2826-469: A monopoly of this trade to the Buddhist clergy. The Tang government attempted to create an accurate census of the empire's population, mostly for effective taxation and military conscription. The early Tang government established modest grain and cloth taxes on each household, persuading households to register and provide the government with accurate demographic information. In the official census of 609,

2983-577: A number or calendar date to an instant (point in time), quantifying the duration of a time interval, and establishing a chronology (ordering of events). In modern times, several time specifications have been officially recognized as standards, where formerly they were matters of custom and practice. The invention in 1955 of the caesium atomic clock has led to the replacement of older and purely astronomical time standards such as sidereal time and ephemeris time , for most practical purposes, by newer time standards based wholly or partly on atomic time using

3140-480: A rebellion by Huang Chao (874–884) devastated both northern and southern China, took an entire decade to suppress, resulted in the sacking of both Chang'an and Luoyang. In 878–879, Huang's army committed a massacre in the southern port of Guangzhou against foreign Arab and Persian Muslim, Zoroastrian, Jewish and Christian merchants. A medieval Chinese source claimed that Huang Chao killed 8 million people. The Tang never recovered from Huang's rebellion, which paved

3297-486: A recurring pattern of ages or cycles, where events and phenomena repeated themselves in a predictable manner. One of the most famous examples of this concept is found in Hindu philosophy , where time is depicted as a wheel called the " Kalachakra " or "Wheel of Time." According to this belief, the universe undergoes endless cycles of creation, preservation, and destruction. Similarly, in other ancient cultures such as those of

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3454-514: A school to prepare candidates for Taoist examinations. In 726, he called upon the Indian monk Vajrabodhi (671–741) to perform tantric rites to avert a drought. In 742, he personally held the incense burner while patriarch of the Shingon school Amoghavajra (705–774) recited "mystical incantations to secure the victory of Tang forces". Emperor Xuanzong closely regulated religious finances. Near

3611-548: A screen. When Empress Wu's eldest son, the crown prince, began to assert his authority and advocate policies opposed by Empress Wu, he suddenly died in 675. Many suspected he was poisoned by Empress Wu. Although the next heir apparent kept a lower profile, Wu accused him of plotting a rebellion in 680; he was banished and later obliged to commit suicide. In 683, Emperor Gaozong died and was succeeded by Emperor Zhongzong , his eldest surviving son by Wu. Zhongzong tried to appoint his wife's father as chancellor: after only six weeks on

3768-424: A small scale in Sui and Tang times, played a central role in the fashioning of this new elite. The early Song emperors, concerned above all to avoid domination of the government by military men, greatly expanded the civil service examination system and the government school system. From the outset, religion played a role in Tang politics. In his bid for power, Li Yuan had attracted a following by claiming descent from

3925-525: A year and 20 days in a month, plus five epagomenal days at the end of the year. The reforms of Julius Caesar in 45 BC put the Roman world on a solar calendar . This Julian calendar was faulty in that its intercalation still allowed the astronomical solstices and equinoxes to advance against it by about 11 minutes per year. Pope Gregory XIII introduced a correction in 1582; the Gregorian calendar

4082-768: Is a fundamental concept to define other quantities, such as velocity . To avoid a circular definition, time in physics is operationally defined as "what a clock reads", specifically a count of repeating events such as the SI second . Although this aids in practical measurements, it does not address the essence of time. Physicists developed the concept of the spacetime continuum, where events are assigned four coordinates: three for space and one for time. Events like particle collisions , supernovas , or rocket launches have coordinates that may vary for different observers, making concepts like "now" and "here" relative. In general relativity , these coordinates do not directly correspond to

4239-458: Is a theoretical ideal scale realized by TAI. Geocentric Coordinate Time and Barycentric Coordinate Time are scales defined as coordinate times in the context of the general theory of relativity. Barycentric Dynamical Time is an older relativistic scale that is still in use. Many ancient cultures, particularly in the East, had a cyclical view of time. In these traditions, time was often seen as

4396-430: Is credited to Egyptians because of their sundials, which operated on a duodecimal system. The importance of the number 12 is due to the number of lunar cycles in a year and the number of stars used to count the passage of night. The most precise timekeeping device of the ancient world was the water clock , or clepsydra , one of which was found in the tomb of Egyptian pharaoh Amenhotep I . They could be used to measure

4553-500: Is dominated by temporality ( kala ), everything within time is subject to change and decay. Overcoming pain and death requires knowledge that transcends temporal existence and reveals its eternal foundation. Two contrasting viewpoints on time divide prominent philosophers. One view is that time is part of the fundamental structure of the universe  – a dimension independent of events, in which events occur in sequence . Isaac Newton subscribed to this realist view, and hence it

4710-504: Is in Byrhtferth 's Enchiridion (a science text) of 1010–1012, where it was defined as 1/564 of a momentum (1 1 ⁄ 2 minutes), and thus equal to 15/94 of a second. It was used in the computus , the process of calculating the date of Easter. As of May 2010 , the smallest time interval uncertainty in direct measurements is on the order of 12 attoseconds (1.2 × 10 seconds), about 3.7 × 10 Planck times . The second (s)

4867-816: Is kept within 0.9 second of UT1 by the introduction of one-second steps to UTC, the leap second . The Global Positioning System broadcasts a very precise time signal based on UTC time. The surface of the Earth is split into a number of time zones . Standard time or civil time in a time zone deviates a fixed, round amount, usually a whole number of hours, from some form of Universal Time, usually UTC. Most time zones are exactly one hour apart, and by convention compute their local time as an offset from UTC. For example, time zones at sea are based on UTC. In many locations (but not at sea) these offsets vary twice yearly due to daylight saving time transitions. Some other time standards are used mainly for scientific work. Terrestrial Time

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5024-411: Is neither an event nor a thing, and thus is not itself measurable nor can it be travelled. Furthermore, it may be that there is a subjective component to time, but whether or not time itself is "felt", as a sensation, or is a judgment, is a matter of debate. In Philosophy, time was questioned throughout the centuries; what time is and if it is real or not. Ancient Greek philosophers asked if time

5181-483: Is not rather than what it is, an approach similar to that taken in other negative definitions . However, Augustine ends up calling time a "distention" of the mind (Confessions 11.26) by which we simultaneously grasp the past in memory, the present by attention, and the future by expectation. Isaac Newton believed in absolute space and absolute time; Leibniz believed that time and space are relational. The differences between Leibniz's and Newton's interpretations came to

5338-666: Is qualitative, as opposed to quantitative. In Greek mythology, Chronos (ancient Greek: Χρόνος) is identified as the Personification of Time. His name in Greek means "time" and is alternatively spelled Chronus (Latin spelling) or Khronos. Chronos is usually portrayed as an old, wise man with a long, gray beard, such as "Father Time". Some English words whose etymological root is khronos/chronos include chronology , chronometer , chronic , anachronism , synchronise , and chronicle . Rabbis sometimes saw time like "an accordion that

5495-600: Is seen as progressing in a straight line from past to future without repetition. In general, the Islamic and Judeo-Christian world-view regards time as linear and directional , beginning with the act of creation by God. The traditional Christian view sees time ending, teleologically, with the eschatological end of the present order of things, the " end time ". In the Old Testament book Ecclesiastes , traditionally ascribed to Solomon (970–928 BC), time (as

5652-447: Is sometimes referred to as Newtonian time . The opposing view is that time does not refer to any kind of "container" that events and objects "move through", nor to any entity that "flows", but that it is instead part of a fundamental intellectual structure (together with space and number) within which humans sequence and compare events. This second view, in the tradition of Gottfried Leibniz and Immanuel Kant , holds that time

5809-402: Is the SI base unit. A minute (min) is 60 seconds in length (or, rarely, 59 or 61 seconds when leap seconds are employed), and an hour is 60 minutes or 3600 seconds in length. A day is usually 24 hours or 86,400 seconds in length; however, the duration of a calendar day can vary due to Daylight saving time and Leap seconds . A time standard is a specification for measuring time: assigning

5966-514: Is unless we experience it first hand. Time is not an empirical concept. For neither co-existence nor succession would be perceived by us, if the representation of time did not exist as a foundation a priori . Without this presupposition, we could not represent to ourselves that things exist together at one and the same time, or at different times, that is, contemporaneously, or in succession. Tang dynasty The Tang dynasty ( / t ɑː ŋ / , [tʰǎŋ] ; Chinese : 唐朝 ), or

6123-508: The Portraits of Periodical Offering , probably painted by Yan Liben (601–673). Having entered Emperor Gaozong's court as a lowly consort, Wu Zetian ultimately acceded to the highest position of power in 690, establishing the short-lived Wu Zhou. Emperor Gaozong suffered a stroke in 655, and Wu began to make many of his court decisions for him, discussing affairs of state with his councillors, who took orders from her while she sat behind

6280-578: The Clock of the Long Now . They can be driven by a variety of means, including gravity, springs, and various forms of electrical power, and regulated by a variety of means such as a pendulum . Alarm clocks first appeared in ancient Greece around 250 BC with a water clock that would set off a whistle. This idea was later mechanized by Levi Hutchins and Seth E. Thomas . A chronometer is a portable timekeeper that meets certain precision standards. Initially,

6437-594: The Han dynasty . The Li family founded the dynasty after taking advantage of a period of Sui decline and precipitating their final collapse, in turn inaugurating a period of progress and stability in the first half of the dynasty's rule. The dynasty was formally interrupted during 690–705 when Empress Wu Zetian seized the throne, proclaiming the Wu Zhou dynasty and becoming the only legitimate Chinese empress regnant . The An Lushan rebellion (755–763) led to devastation and

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6594-639: The Hexi Corridor and Dunhuang in Gansu ; in 848, the general Zhang Yichao (799–872) managed to wrestle control of the region from the Tibetan Empire during its civil war . Shortly afterwards, Emperor Xuanzong of Tang ( r.  846–859 ) acknowledged Zhang as the protector ( 防禦使 ; fángyùshǐ ) of Sha Prefecture, and military governor of the new Guiyi Circuit . In addition to factors like natural calamity and jiedushi claiming autonomy,

6751-532: The International System of Units (SI) and International System of Quantities . The SI base unit of time is the second , which is defined by measuring the electronic transition frequency of caesium atoms. General relativity is the primary framework for understanding how spacetime works. Through advances in both theoretical and experimental investigations of spacetime, it has been shown that time can be distorted and dilated , particularly at

6908-665: The Tang Empire , was an imperial dynasty of China that ruled from 618 to 907, with an interregnum between 690 and 705. It was preceded by the Sui dynasty and followed by the Five Dynasties and Ten Kingdoms period . Historians generally regard the Tang as a high point in Chinese civilisation, and a golden age of cosmopolitan culture. Tang territory, acquired through the military campaigns of its early rulers, rivalled that of

7065-597: The Tibetan Empire had fallen apart in 842, followed soon after by the Uyghur Kingdom of Qocho , the Tang were in no position to reconquer Central Asia after 763. So significant was this loss that half a century later jinshi examination candidates were required to write an essay on the causes of the Tang's decline. Although An Lushan was killed by one of his eunuchs in 757, this time of troubles and widespread insurrection continued until rebel Shi Siming

7222-571: The Xuanwu Gate Incident on July 2, 626. Shortly thereafter, his father abdicated in his favour, and Li Shimin ascended the throne. He is conventionally known by his temple name Taizong. Although killing two brothers and deposing his father contradicted the Confucian value of filial piety , Taizong showed himself to be a capable leader who listened to the advice of the wisest members of his council. In 628, Emperor Taizong held

7379-425: The calendar , a mathematical tool for organising intervals of time, and the clock , a physical mechanism that counts the passage of time. In day-to-day life, the clock is consulted for periods less than a day, whereas the calendar is consulted for periods longer than a day. Increasingly, personal electronic devices display both calendars and clocks simultaneously. The number (as on a clock dial or calendar) that marks

7536-628: The first campaign because they failed to overcome the successful defence led by General Yeon Gaesomun . The Tang entered into the Silla–Tang alliance , the Chinese fought against Baekje and their Yamato Japanese allies in the Battle of Baekgang in August 663, a decisive Tang–Silla victory. The Tang dynasty navy had several different ship types at its disposal to engage in naval warfare , these ships described by Li Quan in his Taipai Yinjing (Canon of

7693-436: The future . It is a component quantity of various measurements used to sequence events, to compare the duration of events or the intervals between them, and to quantify rates of change of quantities in material reality or in the conscious experience . Time is often referred to as a fourth dimension , along with three spatial dimensions . Time is one of the seven fundamental physical quantities in both

7850-600: The "Jade Pure One" ( Chinese : 玉清 ; pinyin : Yùqīng ) or "Honoured Lord of the Origin". Lingbao Tianzun ( 靈寶天尊 , "Lord of the Numinous Treasure") is also known as the "Supreme Pure One" ( Chinese : 上清 ; pinyin : Shàngqīng ), "The Universally Honoured One of Divinities and Treasures", or the "Precious Celestial One". In terms of worldview, the emergence of the Shàngqīng revelations signifies

8007-509: The Chinese model, based his state ceremonies on the Chinese model, and constructed his palace at Fujiwara on the Chinese model of architecture . Many Chinese Buddhist monks came to Japan to help further the spread of Buddhism as well. Two 7th-century monks, Zhi Yu and Zhi You, visited the court of Emperor Tenji ( r.  661–672 ), whereupon they presented a gift of a south-pointing chariot that they had crafted. This vehicle employing

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8164-677: The Hebrew word עידן, זמן iddan (age, as in "Ice age") zĕman(time) is often translated) is a medium for the passage of predestined events. (Another word, زمان" זמן" zamān , meant time fit for an event , and is used as the modern Arabic , Persian , and Hebrew equivalent to the English word "time".) The Greek language denotes two distinct principles, Chronos and Kairos . The former refers to numeric, or chronological, time. The latter, literally "the right or opportune moment", relates specifically to metaphysical or Divine time. In theology, Kairos

8321-463: The Khitans were unsuccessful. He was given great responsibility in Hebei , which allowed him to rebel with an army of more than 100,000 troops. After capturing Luoyang, he named himself emperor of a new, but short-lived, Yan state . Despite early victories scored by the Tang general Guo Ziyi (697–781), the newly recruited troops of the army at the capital were no match for An Lushan's frontier veterans;

8478-587: The Kingdom of Goguryeo was destroyed by 668. Although they were formerly enemies, the Tang accepted officials and generals of Goguryeo into their administration and military, such as the brothers Yeon Namsaeng (634–679) and Yeon Namsan (639–701). From 668 to 676, the Tang Empire controlled northern Korea. However, Silla broke the alliance in 671, and began the Silla–Tang War to expel the Tang forces. At

8635-664: The Law to all living beings. Therefore, He is also known as Shībǎo ( 師寶 ) "Treasure of the Master". Each of the Three Pure Ones represents both a primordial deity and a heaven . Yuanshi Tianzun rules the first heaven, Yu-Qing, which is found in the Jade Mountain. The entrance to this heaven is named the Golden Door. "He is the source of all truth, as the sun is the source of all light". Lingbao Tianzun rules over

8792-529: The Mayans, Aztecs, and Chinese, there were also beliefs in cyclical time, often associated with astronomical observations and calendars. These cultures developed complex systems to track time, seasons, and celestial movements, reflecting their understanding of cyclical patterns in nature and the universe. The cyclical view of time contrasts with the linear concept of time more common in Western thought, where time

8949-480: The Middle Dutch word klocke which, in turn, derives from the medieval Latin word clocca , which ultimately derives from Celtic and is cognate with French, Latin, and German words that mean bell . The passage of the hours at sea was marked by bells and denoted the time (see ship's bell ). The hours were marked by bells in abbeys as well as at sea. Clocks can range from watches to more exotic varieties such as

9106-559: The Never-ending Primordial Beginning") at a time of pre-Creation, manifesting into the first of the Taoist Trinity, Yuánshǐ Tiānzūn . Yuánshǐ Tiānzūn oversees the earliest phase of Creation of the Universe, and is henceforth known as Dàobǎo ( 道寶 ) "Treasure of the Tao". In One produces Two—Taiji produces Yin Yang, Yuanshi Tianzun manifests into Lingbao Tianzun who separated the Yang from the Yin,

9263-517: The SI second. International Atomic Time (TAI) is the primary international time standard from which other time standards are calculated. Universal Time (UT1) is mean solar time at 0° longitude, computed from astronomical observations. It varies from TAI because of the irregularities in Earth's rotation. Coordinated Universal Time (UTC) is an atomic time scale designed to approximate Universal Time. UTC differs from TAI by an integral number of seconds. UTC

9420-481: The Song dynasty, when it doubled to 100 million because of extensive rice cultivation in central and southern China, coupled with higher yields of grain sold in a growing market. The 7th and first half of the 8th century are generally considered to be the era in which the Tang reached the zenith of its power. In this period, Tang control extended further west than any previous dynasty, stretching from north Vietnam in

9577-411: The Tang capital Chang'an and with it the imperial family. By 903, he forced Emperor Zhaozong of Tang to move the capital to Luoyang, preparing to take the throne for himself. In 904, Zhu assassinated Emperor Zhaozong to replace him with the emperor's young son Emperor Ai of Tang . In 905, Zhu executed the brothers of Emperor Ai as well as many officials and Empress Dowager He . In 907, the Tang dynasty

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9734-529: The Tang census of 754, there were 1,859 cities, 321 prefectures , and 1,538 counties throughout the empire. Although there were many large and prominent cities, the rural and agrarian areas comprised 80–90% of the population. There was also a dramatic migration from northern to southern China , as the North held 75% of the overall population at the dynasty's inception, which by its end was reduced to 50%. The Chinese population would not dramatically increase until

9891-444: The Tang dynasty until the end of 755, there were approximately ten Turkic generals serving under the Tang. While most of the Tang army was made of fubing Chinese conscripts, the majority of the troops led by Turkic generals were of non-Chinese origin, campaigning largely in the western frontier where the presence of fubing troops was low. Some "Turkic" troops were tribalised Han Chinese, a desinicised people. Civil war in China

10048-571: The Tang exerted a powerful cultural influence over neighbouring East Asian nations such as Japan and Korea . Chinese culture flourished and further matured during the Tang era. It is traditionally considered the greatest age for Chinese poetry . Two of China's most famous poets, Li Bai and Du Fu , belonged to this age, contributing with poets such as Wang Wei to the monumental Three Hundred Tang Poems . Many famous painters such as Han Gan , Zhang Xuan , and Zhou Fang were active, while Chinese court music flourished with instruments such as

10205-411: The Tang government responded effectively to natural disasters by extending the price-regulation granary system throughout the country. The central government was able then to build a large surplus stock of foods to ward off the rising danger of famine and increased agricultural productivity through land reclamation . Although these natural calamities and rebellions stained the reputation and hampered

10362-519: The Taoist sage Laozi ( fl.  6th century BC ). People bidding for office would request the prayers of Buddhist monks, with successful aspirants making donations in return. Before the persecution of Buddhism in the 9th century, Buddhism and Taoism were both accepted. Religion was central in the reign of Emperor Xuanzong ( r.  712–756 ). The Emperor invited Taoist and Buddhist monks and clerics to his court, exalted Laozi with grand titles, wrote commentary on Taoist scriptures, and set up

10519-479: The Turks. As early as the Sui dynasty, the Turks had become a major militarised force employed by the Chinese . When the Khitans began raiding northeast China in 605, a Chinese general led 20,000 Turks against them, distributing Khitan livestock and women to the Turks as a reward. On two occasions between 635 and 636, Tang royal princesses were married to Turk mercenaries or generals in Chinese service. Throughout

10676-543: The Western Regions against Gaochang in 640, Karasahr in 644 and 648, and Kucha in 648. The wars against the Western Turks continued under Emperor Gaozong , and the Western Turkic Khaganate was finally annexed after General Su Dingfang 's defeat of Khagan Ashina Helu in 657. Around this time, the Tang court enjoyed visits by numerous dignitaries from foreign lands. These were depicted in

10833-468: The Western Turks ruled by Ashina Helu. The Tang Empire competed with the Tibetan Empire for control of areas in Inner and Central Asia, which was at times settled with marriage alliances such as the marrying of Princess Wencheng ( d.  680 ) to Songtsän Gampo ( d.  649 ). A Tibetan tradition mentions that Chinese troops captured Lhasa after Songtsän Gampo's death, but no such invasion

10990-618: The White and Gloomy Planet of War) of 759. The Battle of Baekgang was actually a restoration movement by remnant forces of Baekje, since their kingdom was toppled in 660 by a Tang–Silla invasion, led by Chinese general Su Dingfang and Korean general Kim Yushin (595–673). In another joint invasion with Silla, the Tang army severely weakened the Goguryeo Kingdom in the north by taking out its outer forts in 645. With joint attacks by Silla and Tang armies under commander Li Shiji (594–669),

11147-537: The Yellow Emperor when Laozi came to be identified as a confidant of royalty. Traditional accounts, such as the life-story summarized earlier, transformed him into a cultural hero whose mother conceived him virginally. By the mid-second century C.E., Laozi had become the deity who delivered to Zhang Daoling the revelation of a new religious faith, giving rise to the Celestial Master's school. His image

11304-477: The ability to maintain their own armies, collect taxes, and pass their titles on hereditarily. This is commonly recognised as the beginning of the fall of Tang's central government. By 737, Emperor Xuanzong discarded the policy of conscripting soldiers that were replaced every three years, replacing them with long-service soldiers who were more battle-hardened and efficient. It was more economically feasible as well, since training new recruits and sending them out to

11461-492: The administrations that implemented policy, each of which was assigned different tasks. These Three Departments and Six Ministries included the personnel administration, finance, rites, military, justice, and public works—an administrative model which lasted until the fall of the Qing dynasty (1644–1912). Although the founders of the Tang related to the glory of the earlier Han dynasty (202 BC – 220 AD),

11618-413: The age of 18, had prowess with bow and arrow, sword and lance and was known for his effective cavalry charges. Fighting a numerically superior army, he defeated Dou Jiande (573–621) at Luoyang in the Battle of Hulao on May 28, 621. Due to fear of assassination, Li Shimin ambushed and killed two of his brothers, Li Yuanji ( b.  603 ) and crown prince Li Jiancheng ( b.  589 ), in

11775-437: The ailing Tang was also challenged when natural disasters led many to believe that the Tang had lost their right to rule. In 873, a disastrous harvest shook the foundations of the empire; in some areas only half of all agricultural produce was gathered, and tens of thousands faced famine and starvation. In the earlier period of the Tang, the central government was able to meet crises in the harvest—from 714 to 719, records show that

11932-470: The basis for much of their administrative organisation was very similar to the previous Northern and Southern dynasties . The Northern Zhou (6th century) fubing system of divisional militia was continued by the Tang, along with farmer-soldiers serving in rotation from the capital or frontier in order to receive appropriated farmland. The equal-field system of the Northern Wei (4th–6th centuries)

12089-727: The beginning of his reign in 713, he liquidated the Inexhaustible Treasury of a prominent Buddhist monastery in Chang'an which had collected vast riches as multitudes of anonymous repentants left money, silk, and treasure at its doors. Although the monastery used its funds generously, the Emperor condemned it for fraudulent banking practices , and distributed its wealth to other Buddhist and Taoist monasteries, and to repair local statues, halls, and bridges. In 714, he forbade Chang'an shops from selling copied Buddhist sutras, giving

12246-423: The capital. Students of Confucian studies were candidates for the imperial examinations , which qualified their graduates for appointment to the local, provincial, and central government bureaucracies. Two types of exams were given, mingjing ( 明經 ; 'illuminating the classics') and jinshi ( 進士 ; 'presented scholar'). The mingjing was based upon the Confucian classics and tested the student's knowledge of

12403-523: The causal structure of events. Instead, the spacetime interval is calculated and classified as either space-like or time-like, depending on whether an observer exists that would say the events are separated by space or by time. Since the time required for light to travel a specific distance is the same for all observers—a fact first publicly demonstrated by the Michelson–Morley experiment —all observers will consistently agree on this definition of time as

12560-573: The clear from the murky, and classified the elements into their rightful groups. Therefore, he is also known as Jīngbǎo ( 經寶 ) "Treasure of the Law/Scripture". While Jīng in popular understanding means "scriptures", in this context it also mean "passing through" [the phase of Creation] and the Laws of Nature of how things are meant to be. In the final phase of Creation, Daode Tianzun is manifested from Língbăo Tiānzūn to bring civilization and preach

12717-467: The conditions for a massive rebellion against Xuanzong. The Tang Empire was at its height of power up until the middle of the 8th century, when the An Lushan rebellion (755–763) destroyed the prosperity of the empire. An Lushan was a half- Sogdian , half- Turkic Tang commander since 744, who had experience fighting the Khitans of Manchuria with a victory in 744, yet most of his campaigns against

12874-534: The court fled Chang'an. While the heir apparent raised troops in Shanxi and Xuanzong fled to Sichuan , they called upon the help of the Uyghur Khaganate in 756. The Uyghur khan Moyanchur was greatly excited at this prospect, and married his own daughter to the Chinese diplomatic envoy once he arrived, receiving in turn a Chinese princess as his bride. The Uyghurs helped recapture the Tang capital from

13031-418: The decline of central authority during the latter half of the dynasty. Like the previous Sui dynasty , the Tang maintained a civil-service system by recruiting scholar-officials through standardised examinations and recommendations to office. The rise of regional military governors known as jiedushi during the 9th century undermined this civil order. The dynasty and central government went into decline by

13188-506: The dynasty's end. From its numerous subjects, the dynasty raised professional and conscripted armies of hundreds of thousands of troops to contend with nomadic powers for control of Inner Asia and the lucrative trade-routes along the Silk Road . Far-flung kingdoms and states paid tribute to the Tang court, while the Tang also indirectly controlled several regions through a protectorate system. In addition to its political hegemony ,

13345-566: The earlier Han dynasty, the Tang and their Turkic allies conquered and subdued Central Asia during the 640s and 650s. During Emperor Taizong's reign alone, large campaigns were launched against not only the Göktürks , but also separate campaigns against the Tuyuhun , the oasis states , and the Xueyantuo . Under Emperor Gaozong, a campaign led by the general Su Dingfang was launched against

13502-552: The earth force includes all of the forces inside the planet as well as the five elemental forces. As the Three Pure Ones are manifestations of Primordial Celestial Energy, they are formless. But to illustrate their role in Creation, they are often portrayed as elderly deities robed in the three basic colours from which all colours originated: Red, Blue and Yellow (or Green) depending on personal interpretation of colour origins by additive or subtractive means. Each of them holds onto

13659-402: The edges of black holes . Throughout history, time has been an important subject of study in religion, philosophy, and science. Temporal measurement has occupied scientists and technologists and has been a prime motivation in navigation and astronomy . Time is also of significant social importance, having economic value (" time is money ") as well as personal value, due to an awareness of

13816-435: The effectiveness of the central government, the early 9th century is nonetheless viewed as a period of recovery for the Tang. The government's withdrawal from its role in managing the economy had the unintended effect of stimulating trade, as more markets with fewer bureaucratic restrictions were opened up. By 780, the old grain tax and labour service of the 7th century was replaced by a semi-annual tax paid in cash, signifying

13973-523: The events of the abbeys and monasteries of the Middle Ages. Richard of Wallingford (1292–1336), abbot of St. Alban's abbey, famously built a mechanical clock as an astronomical orrery about 1330. Great advances in accurate time-keeping were made by Galileo Galilei and especially Christiaan Huygens with the invention of pendulum-driven clocks along with the invention of the minute hand by Jost Burgi. The English word clock probably comes from

14130-405: The far reaches of the world and in the stars, and imagined along the lines of the ancient paradises Penglai and Kunlun . It was populated by various divine figures: pure gods of the Tao who were emanations of original cosmic qi; immortals who had attained celestial status through effort and the proper elixir... Lingbao Tianzun is associated with yin and yang and was responsible as the custodian of

14287-439: The first mechanical clocks driven by an escapement mechanism. The hourglass uses the flow of sand to measure the flow of time. They were used in navigation. Ferdinand Magellan used 18 glasses on each ship for his circumnavigation of the globe (1522). Incense sticks and candles were, and are, commonly used to measure time in temples and churches across the globe. Water clocks, and, later, mechanical clocks, were used to mark

14444-484: The form of Laozi . Daode Tianzun is also the treasurer of spirits, known as the Lord of Man who is the founder of Taoism. He is the most eminent, aged ruler, which is why he is the only Pure One depicted with pure white hair and beard. There seem to have been a number of stages in the process of Laozi's eventual deification. First, the legendary figure began as a teacher and writer whose image eventually blended with that of

14601-481: The frequency of electronic transitions in certain atoms to measure the second. One of the atoms used is caesium ; most modern atomic clocks probe caesium with microwaves to determine the frequency of these electron vibrations. Since 1967, the International System of Measurements bases its unit of time, the second, on the properties of caesium atoms. SI defines the second as 9,192,631,770 cycles of

14758-611: The frontier every three years drained the treasury. By the late 7th century, the fubing troops began abandoning military service and the homes provided to them in the equal-field system. The supposed standard of 100 mu of land allotted to each family was in fact decreasing in size in places where population expanded and the wealthy bought up most of the land. Hard-pressed peasants and vagrants were then induced into military service with benefits of exemption from both taxation and corvée labour service, as well as provisions for farmland and dwellings for dependents who accompanied soldiers on

14915-544: The frontier. By 742, the total number of enlisted troops in the Tang armies had risen to about 500,000 men. In East Asia, Tang military campaigns were less successful elsewhere than in previous imperial Chinese dynasties. Like the emperors of the Sui dynasty before him , Taizong established a military campaign in 644 against the Korean kingdom of Goguryeo in the Goguryeo–Tang War ; however, this led to its withdrawal in

15072-437: The government had to officially acknowledge the jiedushi ' s hereditary rule without accreditation. The Tang government relied on these governors and their armies for protection and to suppress local revolts. In return, the central government would acknowledge the rights of these governors to maintain their army, collect taxes and even to pass on their title to heirs. As time passed, these military governors slowly phased out

15229-417: The heaven of Shang-Qing. Daode Tianzun rules over the heaven of Tai-Qing. The Three Pure Ones are often depicted as throned elders. Schools of Taoist thought developed around each of these deities. Taoist Alchemy was a large part of these schools, as each of the Three Pure Ones represented one of the three essential fields of the body: jing , qi and shen . The congregation of all three Pure Ones resulted in

15386-438: The hours even at night but required manual upkeep to replenish the flow of water. The ancient Greeks and the people from Chaldea (southeastern Mesopotamia) regularly maintained timekeeping records as an essential part of their astronomical observations. Arab inventors and engineers, in particular, made improvements on the use of water clocks up to the Middle Ages. In the 11th century, Chinese inventors and engineers invented

15543-498: The imperial court. From Tang times until the end of the Qing dynasty in 1912, scholar-officials served as intermediaries between the people and the government. The potential of a widespread examination system was not fully realised until the succeeding Song dynasty, when the merit-driven scholar official largely shed his aristocratic habits and defined his social status through the examination system. The examination system, used only on

15700-407: The landed wealth and official positions, was largely destroyed or marginalised. During the last two decades of the Tang dynasty, the gradual collapse of central authority led to the rise of the rival military figures Li Keyong and Zhu Wen in northern China. Tang forces had defeated Huang's rebellion with the aid of allied Shatuo , a Turkic people of what is now Shanxi , led by Li Keyong. He

15857-487: The latter half of the 9th century; agrarian rebellions resulted in mass population loss and displacement, widespread poverty, and further government dysfunction that ultimately ended the dynasty in 907. The Tang capital at Chang'an (present-day Xi'an ) was the world's most populous city for much of the dynasty's existence. Two censuses of the 7th and 8th centuries estimated the empire's population at about 50 million people, which grew to an estimated 80 million by

16014-456: The limited time in each day and in human life spans . The concept of time can be complex. Multiple notions exist and defining time in a manner applicable to all fields without circularity has consistently eluded scholars. Nevertheless, diverse fields such as business, industry, sports, the sciences, and the performing arts all incorporate some notion of time into their respective measuring systems . Traditional definitions of time involved

16171-403: The money supply by upholding the use of private coinage, while his aristocratic and technocratic successor Li Linfu ( d.  753 ) favoured government monopoly over the issuance of coinage. After 737, most of Xuanzong's confidence rested in his long-standing chancellor Li Linfu , who championed a more aggressive foreign policy employing non-Chinese generals. This policy ultimately created

16328-417: The more interesting examples of apotheosis, or deification, in the history of religion. According to Daozang , Daode Tianzun had manifested many various incarnations to teach living beings, and Laozi is one of his incarnations. Time Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past , through the present , and into

16485-583: The nature of time. Plato , in the Timaeus , identified time with the period of motion of the heavenly bodies. Aristotle , in Book IV of his Physica defined time as 'number of movement in respect of the before and after'. In Book 11 of his Confessions , St. Augustine of Hippo ruminates on the nature of time, asking, "What then is time? If no one asks me, I know: if I wish to explain it to one that asketh, I know not." He begins to define time by what it

16642-545: The northwest military aristocracy prevalent during the Sui dynasty . According to official Tang records, they were paternally descended from Laozi , the traditional founder of Taoism (whose personal name was Li Dan or Li Er), the Han dynasty general Li Guang , and Li Gao , the founder of the Han-ruled Western Liang kingdom. This family was known as the Longxi Li lineage, which also included

16799-493: The observation of periodic motion such as the apparent motion of the sun across the sky, the phases of the moon, and the passage of a free-swinging pendulum. More modern systems include the Global Positioning System , other satellite systems, Coordinated Universal Time and mean solar time . Although these systems differ from one another, with careful measurements they can be synchronized. In physics, time

16956-511: The occurrence of a specified event as to hour or date is obtained by counting from a fiducial epoch – a central reference point. Artifacts from the Paleolithic suggest that the moon was used to reckon time as early as 6,000 years ago. Lunar calendars were among the first to appear, with years of either 12 or 13 lunar months (either 354 or 384 days). Without intercalation to add days or months to some years, seasons quickly drift in

17113-517: The original forms after her death. Arguably the most important part of her legacy was diminishing the hegemony of the Northwestern aristocracy, allowing people from other clans and regions of China to become more represented in Chinese politics and government. There were many prominent women at court during and after Wu's reign, including Shangguan Wan'er (664–710), a poet, writer, and trusted official in charge of Wu's private office. In 706,

17270-478: The palace with a few followers and slew Empress Wei and her faction. He then installed his father Emperor Ruizong ( r.  710–712 ) on the throne. Just as Emperor Zhongzong was dominated by Empress Wei, so too was Ruizong dominated by Princess Taiping . This ended when Princess Taiping's coup failed in 712, and Emperor Ruizong abdicated to Emperor Xuanzong . The Tang reached its height during Emperor Xuanzong's 44-year reign, which has been characterized as

17427-419: The passage of time from the shadow cast by its crossbar on a nonlinear rule. The T was oriented eastward in the mornings. At noon, the device was turned around so that it could cast its shadow in the evening direction. A sundial uses a gnomon to cast a shadow on a set of markings calibrated to the hour. The position of the shadow marks the hour in local time . The idea to separate the day into smaller parts

17584-496: The popular pipa . Tang scholars compiled a rich variety of historical literature , as well as encyclopaedias and geographical works. Notable innovations included the development of woodblock printing . Buddhism became a major influence in Chinese culture, with native Chinese sects gaining prominence. However, in the 840s, Emperor Wuzong enacted policies to suppress Buddhism , which subsequently declined in influence. The House of Li had ethnic Han origins, and it belonged to

17741-417: The population was tallied at 9 million households, about 50 million people, and this number did not increase in the census of 742. Patricia Ebrey writes that nonwithstanding census undercounting, China's population had not grown significantly since the earlier Han dynasty , which recorded 58 million people in 2 AD. Adshead disagrees, estimating about 75 million people by 750. In

17898-462: The position of Taishang Huang ('retired emperor'), and acted as regent to the puppet child-emperor Yang You . On the news of Emperor Yang's murder by General Yuwen Huaji on June 18, 618, Li Yuan declared himself emperor of the newly founded Tang dynasty. Emperor Gaozu ruled until 626, when he was forcefully deposed by his son Li Shimin , the Prince of Qin. Li Shimin had commanded troops since

18055-404: The practice of selling merchants the rights to buy monopoly salt, which they transported and sold in local markets. In 799, salt accounted for over half of the government's revenues. S. A. M. Adshead writes that this salt tax represents "the first time that an indirect tax, rather than tribute, levies on land or people, or profit from state enterprises such as mines, had been the primary resource of

18212-407: The prominence of civil officials drafted by exams, and became more autonomous from central authority. The rule of these powerful military governors lasted until 960, when a new civil order under the Song dynasty was established. The abandonment of the equal-field system also meant that people could buy and sell land freely; many poor fell into debt because of this and were forced to sell their land to

18369-400: The prominent Tang poet Li Bai . The Tang emperors were partially of Xianbei ancestry, as Emperor Gaozu of Tang 's mother Duchess Dugu was part-Xianbei. Apart from the traditional historiography, some modern historians have suggested the Tang imperial family might have modified its genealogy to conceal their Xianbei heritage. Emperor Gaozu (born Li Yuan) was the founder of the Tang. He

18526-563: The radiation that corresponds to the transition between two electron spin energy levels of the ground state of the Cs atom. Today, the Global Positioning System in coordination with the Network Time Protocol can be used to synchronize timekeeping systems across the globe. In medieval philosophical writings, the atom was a unit of time referred to as the smallest possible division of time. The earliest known occurrence in English

18683-479: The rebels, but they refused to leave until the Tang paid them an enormous sum of tribute in silk. Even Abbasid Arabs assisted the Tang in putting down the rebellion. A massacre of foreign Arab and Persian Muslim merchants by Tian Shengong happened during the An Lushan rebellion in the 760 Yangzhou massacre . The Tibetans took hold of the opportunity and raided many areas under Chinese control, and even after

18840-512: The release of enslaved Chinese prisoners who were captured during the transition from Sui to Tang from the northern frontier; this embassy succeeded in freeing 80,000 Chinese men and women who were then returned to China. While the Turks were settled in the Ordos region (former territory of the Xiongnu ), the Tang government took on the military policy of dominating the central steppe. As during

18997-404: The return to Tao. The first Pure One is universal or heavenly chi. The second Pure One is human plane chi, and the third Pure One is earth chi. Heavenly chi includes the chi or energy of all the planets, stars and constellations as well as the energy of God (the force of creation and universal love). Human plane chi is the energy that exists on the surface of our planet and sustains human life, and

19154-543: The sacred book. Lingbao Tianzun also calculates time and divides it into different epochs. Daode Tianzun ( 道德天尊 , "Lord of the Way and its Virtue", "Honoured Lord of the Tao and the Virtue", or "[T]he Way-and-Its-Power Celestial One"), also known as the " Grand Pure One " ( Chinese : 太清 ; pinyin : Tàiqīng ) or the "Highest Elder Lord" ( 太上老君 , Taishang Laojun). It is believed that Daode Tianzun manifested himself in

19311-876: The same time the Tang faced threats on its western border when a large Chinese army was defeated by the Tibetans on the Dafei River in 670. By 676, the Tang army was expelled out of Korea by a unified Silla . Following a revolt of the Eastern Turks in 679, the Tang abandoned its Korean campaigns. Although the Tang had fought the Japanese, they still held cordial relations with Japan. There were numerous Imperial embassies to China from Japan, diplomatic missions that were not halted until 894 by Emperor Uda ( r.  887–897 ), upon persuasion by Sugawara no Michizane (845–903). The Japanese Emperor Tenmu ( r.  672–686 ) even established his conscripted army on that of

19468-521: The shift to a money economy boosted by the merchant class. Cities in the southern Jiangnan region such as Yangzhou , Suzhou , and Hangzhou prospered the most economically during the late Tang period. The government monopoly on salt production , weakened after the An Lushan rebellion, was placed under the Salt Commission , which became one of the most powerful state agencies, run by capable ministers chosen as specialists. The commission began

19625-494: The south, to a point north of Kashmir bordering Persia in the west, to northern Korea in the north-east. Some of the kingdoms paying tribute to the Tang dynasty included Kashmir , Nepal, Khotan , Kucha , Kashgar , Silla , Champa , and kingdoms located in Amu Darya and Syr Darya valley. Turkic nomads addressed the Tang emperor as Tian Kehan . After the widespread Göktürk revolt of Shabolüe Khan ( d.  658 )

19782-560: The steppe nomads. Chinese foreign policy to the north and west now had to deal with Turkic nomads, who were becoming the most dominant ethnic group in Central Asia. To handle and avoid any threats posed by the Turks, the Sui government repaired fortifications and received their trade and tribute missions. They sent four royal princesses to form heqin marriage alliances with Turkic clan leaders, in 597, 599, 614, and 617. The Sui stirred trouble and conflict among ethnic groups against

19939-609: The subject of how Two produced Three has remained a popular debate among Taoist scholars. Most scholars believe that it refers to the Interaction between Yin and Yang, with the presence of Chi , or life force. In religious Taoism, the theory of how Tao produces One, Two, and Three is also explained. In Tao produces One—Wuji produces Taiji, which represents the Great Tao, embodied by Hundun ( Chinese : 混沌無極元始天王 ; pinyin : Hùndùn Wújí Yuánshǐ Tiānwáng , "Heavenly King of

20096-584: The term was used to refer to the marine chronometer , a timepiece used to determine longitude by means of celestial navigation , a precision first achieved by John Harrison . More recently, the term has also been applied to the chronometer watch , a watch that meets precision standards set by the Swiss agency COSC . The most accurate timekeeping devices are atomic clocks , which are accurate to seconds in many millions of years, and are used to calibrate other clocks and timekeeping instruments. Atomic clocks use

20253-701: The throne, he was deposed by Empress Wu in favour of his younger brother, Emperor Ruizong . This provoked a group of Tang princes to rebel in 684. Wu's armies suppressed them within two months. She proclaimed the Tianshou era of Wu Zhou on October 16, 690, and three days later demoted Emperor Ruizong to crown prince . He was also forced to give up his father's surname Li in favour of the Empress Wu. She then ruled as China's only empress regnant . A palace coup on February 20, 705, forced Empress Wu to yield her position on February 22. The next day, her son Zhongzong

20410-517: The time. Also, some believe that another Taoist trinity of gods evolved into the Pure Ones. Beliefs in the Jade Emperor were taken from other Chinese religious traditions and he was seen as their assistant who managed all of creation. Yuanshi Tianzun ( Chinese : 元始天尊 ; pinyin : Yuánshǐ Tiānzūn , "Lord of Primordial Beginning" or the "Primal Celestial One") is also known as

20567-607: The various regions of the empire, it was recorded in 845 that bandits and river pirates in parties of 100 or more began plundering settlements along the Yangtze River with little resistance. In 858, massive floods along the Grand Canal inundated vast tracts of land and terrain of the North China Plain , which drowned tens of thousands of people in the process. The Chinese belief in the Mandate of Heaven granted to

20724-417: The way for the later overthrow of the Tang. Large groups of bandits in the size of small armies ravaged the countryside in the last years of the Tang. They smuggled illicit salt, ambushed merchants and convoys, and even besieged several walled cities. Amid the sacking of cities and murderous factional strife among eunuchs and officials, the top tier of aristocratic families, which had amassed a large fraction of

20881-488: The wealthy, which led to the exponential growth of large estates. With the breakdown of the land allocation system after 755, the central Chinese state barely interfered in agricultural management and acted merely as tax collector for roughly a millennium, save a few instances such as the Song's failed land nationalisation during the 13th-century war with the Mongols . With the central government collapsing in authority over

21038-475: The wife of Emperor Zhongzong of Tang, Empress Wei ( d.  710 ), persuaded her husband to staff government offices with his sister and her daughters, and in 709 requested that he grant women the right to bequeath hereditary privileges to their sons (which before was a male right only). Empress Wei eventually poisoned Zhongzong, whereupon she placed his fifteen-year-old son upon the throne in 710. Two weeks later, Li Longji (the later Emperor Xuanzong) entered

21195-445: Was a brief end to the hereditary jiedushi , as Xianzong appointed his own military officers and staffed the regional bureaucracies once again with civil officials. However, Xianzong's successors proved less capable and more interested in the leisure of hunting, feasting, and playing outdoor sports, allowing eunuchs to amass more power as drafted scholar-officials caused strife in the bureaucracy with factional parties. The eunuchs' power

21352-570: Was aided by the fiscal reforms of the 780s, including a government monopoly on the salt industry. He also had an effective and well-trained imperial army stationed at the capital led by his court eunuchs; this was the Army of Divine Strategy, numbering 240,000 in strength as recorded in 798. Between 806 and 819, Emperor Xianzong conducted seven major military campaigns to quell the rebellious provinces that had claimed autonomy from central authority, managing to subdue all but two of them. Under his reign, there

21509-517: Was almost totally diminished by 626, along with the 628 defeat of the Ordos warlord Liang Shidu ; after these internal conflicts, the Tang began an offensive against the Turks. In 630, Tang armies captured areas of the Ordos Desert, modern-day Inner Mongolia province, and southern Mongolia from the Turks. After this military victory, On June 11, 631, Emperor Taizong also sent envoys to the Xueyantuo bearing gold and silk in order to persuade

21666-483: Was also filled with incredible amounts of riches and resources to spare. When the Chinese prefectural government officials travelled to the capital in 643 to give the annual report of the affairs in their districts, Emperor Taizong discovered that many had no proper quarters to rest in and were renting rooms with merchants. Therefore, Emperor Taizong ordered the government agencies in charge of municipal construction to build every visiting official his own private mansion in

21823-447: Was also kept, although there were a few modifications. Although the central and local governments kept an enormous number of records about land property in order to assess taxes, it became common practice in the Tang for literate and affluent people to create their own private documents and signed contracts. These had their own signature and that of a witness and scribe in order to prove in court (if necessary) that their claim to property

21980-485: Was an illusion to humans. Plato believed that time was made by the Creator at the same instant as the heavens. He also says that time is a period of motion of the heavenly bodies . Aristotle believed that time correlated to movement, that time did not exist on its own but was relative to motion of objects. He also believed that time was related to the motion of celestial bodies ; the reason that humans can tell time

22137-466: Was because of orbital periods and therefore there was a duration on time. The Vedas , the earliest texts on Indian philosophy and Hindu philosophy dating to the late 2nd millennium BC , describe ancient Hindu cosmology , in which the universe goes through repeated cycles of creation, destruction and rebirth, with each cycle lasting 4,320 million years. Ancient Greek philosophers , including Parmenides and Heraclitus , wrote essays on

22294-482: Was complete, Daode Tianzun took his place on the right, with the fan symbolizing the completion of Creation, and the act of fanning representing the spreading of Tao to all Mankind. Some scholars believe depictions and theology of the Three Pure Ones from the Tang dynasty and after were influenced by Church of the East conception about the Trinity because of the heavy Christian-Taoist contact and mutual influence of

22451-650: Was designed to draw the best talent into government. But perhaps an even greater consideration for the Tang rulers was to avoid imperial dependence on powerful aristocratic families and warlords by recruiting a body of career officials having no family or local power base. The Tang law code ensured equal division of inherited property among legitimate heirs, encouraging social mobility by preventing powerful families from becoming landed nobility through primogeniture . The competition system proved successful, as scholar-officials acquired status in their local communities while developing an esprit de corps that connected them to

22608-545: Was different when a servant or nephew killed a master or an uncle than when a master or uncle killed a servant or nephew. The Tang Code was largely retained by later codes such as the early Ming dynasty (1368–1644) code of 1397, yet there were several revisions in later times, such as improved property rights for women during the Song dynasty (960–1279). The Tang had three departments ( 省 ; shěng ), which were obliged to draft, review, and implement policies respectively. There were also six ministries ( 部 ; bù ) under

22765-595: Was ended when Zhu deposed Ai and took the throne for himself (known posthumously as Emperor Taizu of Later Liang). He established the Later Liang , which inaugurated the Five Dynasties and Ten Kingdoms period . A year later, Zhu had the deposed Emperor Ai poisoned to death. Zhu Wen's enemy Li Keyong died in 908, having never claimed the title of emperor out of loyalty to the Tang. His son Li Cunxu (Emperor Zhuangzong) inherited his title Prince of Jin along with his father's rivalry against Zhu. In 923, Li Cunxu declared

22922-421: Was established in 653; it was divided into 500 articles specifying different crimes and penalties ranging from ten blows with a light stick, one hundred blows with a heavy rod, exile, penal servitude, or execution. The legal code distinguished different levels of severity in meted punishments when different members of the social and political hierarchy committed the same crime. For example, the severity of punishment

23079-480: Was expanded and collapsed at will." According to Kabbalists , "time" is a paradox and an illusion . According to Advaita Vedanta , time is integral to the phenomenal world, which lacks independent reality. Time and the phenomenal world are products of maya , influenced by our senses, concepts, and imaginations. The phenomenal world, including time, is seen as impermanent and characterized by plurality, suffering, conflict, and division. Since phenomenal existence

23236-470: Was killed by his own son in 763. After 710, regional military governors called jiedushi gradually came to challenge the power of the central government. After the An Lushan rebellion, the autonomous power and authority accumulated by the jiedushi in Hebei went beyond the central government's control. After a series of rebellions between 781 and 784 in present-day Hebei, Henan , Shandong , and Hubei,

23393-491: Was legitimate. The prototype of this actually existed since the ancient Han dynasty, while contractual language became even more common and embedded into Chinese literary culture in later dynasties. The centre of the political power of the Tang was the capital city of Chang'an (modern Xi'an ), where the emperor maintained his large palace quarters and entertained political emissaries with music, sports, acrobats, poetry, paintings, and dramatic theatre performances . The capital

23550-466: Was linear or cyclical and if time was endless or finite . These philosophers had different ways of explaining time; for instance, ancient Indian philosophers had something called the Wheel of Time. It is believed that there was repeating ages over the lifespan of the universe. This led to beliefs like cycles of rebirth and reincarnation . The Greek philosophers believe that the universe was infinite, and

23707-465: Was made a jiedushi , and later Prince of Jin , bestowed with the imperial surname Li by the Tang court. Zhu Wen, originally a salt smuggler who served as a lieutenant under the rebel Huang Chao, surrendered to Tang forces. By helping to defeat Huang, he was renamed Zhu Quanzhong ("Zhu of Perfect Loyalty") and granted a rapid series of promotions to military governor of Xuanwu Circuit. In 901, from his power base of Kaifeng , Zhu Wen seized control of

23864-719: Was not challenged following the Ganlu Incident , where Emperor Wenzong ( r.  826–840 ) failed in his plot to have them overthrown; instead, Wenzong's allies were publicly executed in Chang'an's West Market on the eunuchs' command. Decades after the An Lushan rebellion, the Tang was able to muster enough power to launch offensive military campaigns, including its destruction of the Uyghur Khaganate in Mongolia from 840 to 847. The Tang managed to restore indirect control over former territories as far west as

24021-533: Was only slowly adopted by different nations over a period of centuries, but it is now by far the most commonly used calendar around the world. During the French Revolution , a new clock and calendar were invented as part of the dechristianization of France and to create a more rational system in order to replace the Gregorian calendar. The French Republican Calendar 's days consisted of ten hours of

24178-572: Was previously Duke of Tang and governor of Taiyuan , the capital of modern Shanxi , during the collapse of the Sui dynasty (581–618). Li had prestige and military experience, and was a first cousin of Emperor Yang of Sui (their mothers were both one of the Dugu sisters ). Li Yuan rose in rebellion in 617, along with his son and his equally militant daughter Princess Pingyang ( d.  623 ), who raised and commanded her own troops. In winter 617, Li Yuan occupied Chang'an , relegated Emperor Yang to

24335-533: Was put down at Issyk Kul in 657 by Su Dingfang (591–667), Emperor Gaozong established several protectorates governed by a Protectorate General or Grand Protectorate General, which extended the Chinese sphere of influence as far as Herat in Western Afghanistan. Protectorate Generals were given a great deal of autonomy to handle local crises without waiting for central admission. After Xuanzong's reign, jiedushi were given enormous power, including

24492-554: Was restored to power; the Tang was formally restored on March 3. She died soon after. To legitimise her rule, she circulated a document known as the Great Cloud Sutra , which predicted that a reincarnation of the Maitreya Buddha would be a female monarch who would dispel illness, worry, and disaster from the world. She even introduced numerous revised written characters for the language, though they reverted to

24649-416: Was still not complete. Next, perhaps also around the second or third century CE, Laozi seems to have been identified as a creator god who also enters the world to rescue humanity from tribulation. Laozi was now capable of incarnating himself, almost like Buddhist bodhisattvas. Not long thereafter he joined the triad of the Three Pure Ones, and finally Laozi emerged as the chief divine person. We have here one of

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