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67-449: This mountain is thought by some researchers and historians to be the famous landmark of antiquity known as the “ Stone Tower ”, which Claudius Ptolemy wrote about in his famous treatise Geography . It marked the midpoint on the ancient Silk Road , the overland trade route taken by caravans between Europe and Asia. Sulayman (Solomon) is a prophet in the Qur'an , and the mountain contains

134-412: A hydrostatic balance to determine the density and purity of metals and precious stones. He classified gems by what he considered their primary physical properties, such as specific gravity and hardness , rather than the common practice of the time of classifying them by colour. Biruni's main essay on political history, Kitāb al-musāmara fī aḵbār Ḵᵛārazm (" Book of nightly conversation concerning

201-467: A cubit is not clear; with an 18-inch cubit his estimate would be 3,600 miles, whereas with a 22-inch cubit his estimate would be 4,200 miles. One significant problem with this approach is that Al-Biruni was not aware of atmospheric refraction and made no allowance for it. He used a dip angle of 34 arc minutes in his calculations, but refraction can typically alter the measured dip angle by about 1/6, making his calculation only accurate to within about 20% of

268-597: A given group of people, learnt their language and studied their primary texts, presenting his findings with objectivity and neutrality using cross-cultural comparisons. Akhbar S. Ahmed concluded that Al-Biruni can be considered as the first anthropologist, others, however, have argued that he can hardly be considered an anthropologist in the conventional sense. Biruni's fame as an Indologist rests primarily on two texts. Biruni wrote an encyclopedic work on India called Taḥqīq mā li-l-Hind min maqūlah maqbūlah fī al-ʿaql aw mardhūlah (variously translated as Verifying All That

335-654: A profound influence through the ages on not only cartography but also the history of ancient geography. In Book I he mentions the Stone Tower ten times , and with a familiarity that suggests this was a well-known and established landmark. He refers to it just once more, in his gazetteer in Book VI when he details the Seventh Map of Asia, and on this occasion goes further to reveals its coordinates as longitude 135 and latitude 43 degrees north on his gradation system. But

402-467: A refutation of astrology, in contradistinction to the legitimate science of astronomy, for which he expresses wholehearted support. Some suggest that his reasons for refuting astrology relate to the methods used by astrologers being based upon pseudoscience rather than empiricism and also to a conflict between the views of the astrologers and those of the orthodox theologians of Sunni Islam . He wrote an extensive commentary on Indian astronomy in

469-416: A rich cultural context. He expressed his objectives with simple eloquence: He also translated the yoga sutras of Indian sage Patanjali with the title Tarjamat ketāb Bātanjalī fi’l-ḵalāṣ men al-ertebāk : I shall not produce the arguments of our antagonists in order to refute such of them, as I believe to be in the wrong. My book is nothing but a simple historic record of facts. I shall place before

536-559: A scientific but also a religious dimension: in Islam worship and prayer require a knowledge of the precise directions of sacred locations, which can be determined accurately only through the use of astronomical data. In carrying out his research, al-Biruni used a variety of different techniques dependent upon the particular field of study involved. His major work on astrology is primarily an astronomical and mathematical text; he states: "I have begun with Geometry and proceeded to Arithmetic and

603-590: A shrine that supposedly marks his grave. Women who ascend to the shrine on top and crawl though an opening across the holy rock will, according to legend, give birth to healthy children. The trees and bushes on the mountain are draped with numerous "prayer flags", small pieces of cloth that are tied to them. According to the UNESCO , the mountain is "the most complete example of a sacred mountain anywhere in Central Asia , worshipped over several millennia". The site

670-409: A vast array of topics of Indian culture, including descriptions of their traditions and customs. Although he tried to stay away from political and military history, Biruni did indeed record important dates and noted actual sites of where significant battles occurred. Additionally, he chronicled stories of Indian rulers and told of how they ruled over their people with their beneficial actions and acted in

737-561: Is 41.2 degrees north); while Jean Baptiste Bourguignon d'Anville identified it with the fortress of Aatas, 7 degrees northwest of Kashgar ; and James Bell argued it was near the Pass of Chiltung in the Pamirs . Henry Yule located it nearby at Daraut-Kurgan , while William Bevan & William Smith thought the Stone Tower was probably the same as the "Hormeterium" (or “merchants' station” which Ptolemy also writes about) and located it near

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804-571: Is a stub . You can help Misplaced Pages by expanding it . Stone Tower (Ptolemy) Claudius Ptolemy , the Greco-Egyptian geographer of Alexandria , wrote about a " Stone Tower " (λίθινος πύργος , Lithinos Pyrgos in Greek , Turris Lapidea in Latin ) which marked the midpoint on the ancient Silk Road – the network of overland trade routes taken by caravans between Europe and Asia . It

871-561: Is one, eternal, and omnipotent and eschewing all forms of idol worship. He recognizes that uneducated Hindus worshiped a multiplicity of idols yet points out that even some Muslims (such as the Jabriyah ) have adopted anthropomorphic concepts of God. Al-Biruni wrote about the peoples, customs and religions of the Indian subcontinent. According to Akbar S. Ahmed, like modern anthropologists, he engaged in extensive participant observation with

938-455: Is part of the autonomous republic of Karakalpakstan in northwest Uzbekistan . His name was most commonly latinized as Alberonius . Al-Biruni spent the first twenty-five years of his life in Khwarezm where he studied Islamic jurisprudence , theology, grammar, mathematics, astronomy , medicine and philosophy and dabbled not only in the field of physics, but also in those of most of

1005-557: Is still a popular place for local Muslims, with stairs leading up to the highest peak where there stands a small mosque originally built by Babur in 1510. Much of the mosque was reconstructed in the late 20th century. The rock also contains the National Historical and Archaeological Museum Complex Sulayman that was built during the Soviet era, showing archaeological findings from the area and its history. The lower slope of

1072-468: The Taḥqīq mā li-l-Hind mostly translation of Aryabhatta's work, in which he claims to have resolved the matter of Earth's rotation in a work on astronomy that is no longer extant, his Miftah-ilm-alhai'a (" Key to Astronomy "): [T]he rotation of the earth does in no way impair the value of astronomy, as all appearances of an astronomic character can quite as well be explained according to this theory as to

1139-766: The Afrighids , who were overthrown by the rival dynasty of Ma'munids in 995. He left his homeland for Bukhara , then under the Samanid ruler Mansur II the son of Nuh II . There he corresponded with Avicenna , and there are extant exchanges of views between these two scholars. In 998, he went to the court of the Ziyarid amir of Tabaristan , Qabus ( r.  977–981, 997–1012 ). There he wrote his first important work, al-Athar al-Baqqiya 'an al-Qorun al-Khaliyya ("The remaining traces of past centuries", translated as "Chronology of ancient nations" or "Vestiges of

1206-740: The British Raj , were revisited. The lunar crater Al-Biruni and the asteroid 9936 Al-Biruni are named in his honour. Biruni Island in Antarctica is named after al-Biruni. In Iran, surveying engineers are celebrated on al-Biruni's birthday. In June 2009, Iran donated a pavilion to the United Nations Office in Vienna —placed in the central Memorial Plaza of the Vienna International Center . Named

1273-599: The Mu'tazila , particularly criticising al-Jahiz and Zurqan. He also repudiated Avicenna for his views on the eternality of the universe. Of the 146 books written by al-Bīrūnī, 95 are devoted to astronomy, mathematics, and related subjects like mathematical geography. He lived during the Islamic Golden Age, when the Abbasid Caliphs promoted astronomical research, because such research possessed not only

1340-540: The Scholars Pavilion , it features the statues of four prominent Iranian scholars: Avicenna , Abu Rayhan Biruni, Zakariya Razi (Rhazes) and Omar Khayyam . A film about the life of Al-Biruni, Abu Raykhan Beruni , was released in the Soviet Union in 1974. Irrfan Khan portrayed Al-Biruni in the 1988 Doordarshan historical drama Bharat Ek Khoj . He has been portrayed by Cüneyt Uzunlar in

1407-507: The Sulaiman-Too mountain in Osh . Edward Bunbury thought the information given was too vague to precisely determine its location. In the 20th century, Joseph Hackin travelled there and thought it was at Tashkurgan , while Albert Herrmann placed it in the vicinity of Daraut-Kurgan. Aurel Stein , who perhaps most extensively travelled this region, suggested the valley of Karategin

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1474-580: The Greek, the Arab/Muslim, and the Persian. Biruni also employed astronomy in the determination of his theories, which were complex mathematical equations and scientific calculation that allows one to convert dates and years between the different calendars. The book does not limit itself to tedious records of battle because Biruni found the social culture to be more important. The work includes research on

1541-628: The Indians Recount, the Reasonable and the Unreasonable , or The book confirming what pertains to India, whether rational or despicable , in which he explored nearly every aspect of Indian life. During his journey through India, military and political history were not Biruni's main focus: he decided rather to document the civilian and scholarly aspects of Hindu life, examining culture, science, and religion. He explored religion within

1608-795: The Past") on historical and scientific chronology, probably around 1000, though he later made some amendments to the book. He also visited the court of the Bavandid ruler Al-Marzuban . Accepting the definite demise of the Afrighids at the hands of the Ma'munids, he made peace with the latter who then ruled Khwarezm . Their court at Gorganj (also in Khwarezm) was gaining fame for its gathering of brilliant scientists. In 1017, Mahmud of Ghazni captured Rey. Most scholars, including al-Biruni, were taken to Ghazni,

1675-528: The Science of Numbers, then to the structure of the Universe and finally to Judicial Astrology [ sic ], for no one who is worthy of the style and title of Astrologer [ sic ] who is not thoroughly conversant with these for sciences." In these earlier chapters he lays the foundations for the final chapter, on astrological prognostication , which he criticises. In a later work, he wrote

1742-427: The Soviet period, appears to have received little to no investment since its establishment. Exhibits are often poorly labeled, with some items accompanied by vague or even comical descriptions—such as a historical book simply labeled ‘a book.’ The lack of proper signage, context, and tourist-friendly information makes it difficult for visitors to fully appreciate the site’s cultural and historical importance. Additionally,

1809-450: The Stone Tower could be pin-pointed then not only would this be of great significance to the study of ancient geography, but it would allow other important landmarks in this region, similarly (and imprecisely) detailed by Ptolemy, to be more closely located. Identifying an actual location for this site would also allow archaeological work to be more targeted, increasing the chance of successful excavations. A brief survey of literature reveals

1876-399: The Stone Tower's actual location has been vigorously debated by researchers and historians over the centuries because, despite his coordinates, the information Ptolemy (and other scholars from his era) left behind is simply not precise enough. In part, this is due to the rudimentary methods caravans employed while route surveying distant lands from which ancient cartographers drew their maps. If

1943-579: The affairs of Ḵᵛārazm ") is now known only from quotations in Bayhaqī's Tārīkh-e Masʿūdī. In addition to this various discussions of historical events and methodology are found in connection with the lists of kings in his al-Āthār al-bāqiya and in the Qānūn as well as elsewhere in the Āthār, in India, and scattered throughout his other works. Al-Biruni's Chronology of Ancient Nations attempted to accurately establish

2010-405: The argument of Aristotle, that there is a change in the creator. He further argued that stating there is a change in the creator would mean there is a change in the effect (meaning the universe has change) and that the universe coming into being after not being is such a change (and so arguing there is no change – no beginning – means Aristotle believes the creator is negated). Al-Biruni was proud of

2077-495: The capital of the Ghaznavid dynasty. Biruni was made court astrologer and accompanied Mahmud on his invasions into India, living there for a few years. He was 44 when he went on the journeys with Mahmud of Ghazni. Biruni became acquainted with all things related to India. During this time he wrote his study of India, finishing it around 1030. Along with his writing, Al-Biruni also made sure to extend his study to science while on

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2144-531: The customs and creeds of various nations, his scholarly objectivity earning him the title al-Ustadh ("The Master") in recognition of his remarkable description of early 11th-century India. Al-Biruni's name is derived from the Persian word bērūn or bīrūn ("outskirts"), as he was born in an outlying district of Kath , the capital of the Afrighid kingdom of Khwarazm . The city, now called Beruniy,

2211-466: The difference in daylight hours by latitude, seasons and Earth's relative positions with Moon and stars. At the same time, Biruni was also critical of Indian scribes, who he believed carelessly corrupted Indian documents while making copies of older documents. He also criticized the Hindus on what he saw them do and not do, for example finding them deficient in curiosity about history and religion. One of

2278-464: The expeditions. He sought to find a method to measure the height of the sun, and created a makeshift quadrant for that purpose. Al-Biruni was able to make much progress in his study over the frequent travels that he went on throughout the lands of India. Belonging to the Sunni Ash'ari school, al-Biruni nevertheless also associated with Maturidi theologians. He was however, very critical of

2345-406: The fact that he followed the textual evidence of the religion without being influenced by Greek philosophers such as Aristotle. Al-Biruni contributed to the introduction of the scientific method to medieval mechanics . He developed experimental methods to determine density, using a particular type of hydrostatic balance . Al-Biruni's method of using the hydrostatic balance was precise, and he

2412-929: The interests of the nation. His details are brief and mostly just list rulers without referring to their real names, and he did not go on about deeds that each one carried out during their reign, which keeps in line with Biruni's mission to try to stay away from political histories. Biruni also described the geography of India in his work. He documented different bodies of water and other natural phenomena. These descriptions are useful to today's modern historians because they are able to use Biruni's scholarship to locate certain destinations in modern-day India. Historians are able to make some matches while also concluding that certain areas seem to have disappeared and been replaced with different cities. Different forts and landmarks were able to be located, legitimizing Biruni's contributions with their usefulness to even modern history and archeology. The dispassionate account of Hinduism given by Biruni

2479-423: The length of various historical eras. Biruni is widely considered to be one of the most important Muslim authorities on the history of religion. He is known as a pioneer in the field of comparative religion in his study of, among other creeds, Zoroastrianism , Judaism, Hinduism , Christianity, Buddhism and Islam . He assumed the superiority of Islam: "We have here given an account of these things in order that

2546-579: The likely location of the Stone Tower: (i) the city of Tashkent , in Uzbekistan; (ii) the Sulaiman-Too mountain in Osh , Kyrgyzstan; (iii) the town of Daraut-Kurgan in south-western Kyrgyzstan; and (iv) the town of Tashkurgan , in Xinjiang, China. Some historians also consider the "Hormeterium" which Ptolemy mentioned to be one and the same as the Stone Tower, and believe this landmark to be

2613-506: The long-standing disagreements by geographers and historians to locate the Stone Tower: As far back as the 11th century Al-Biruni suggested it was the city of Tashkent (which means “castle of stone”); Pyrgos can mean fortified town or fortress. In the 19th century, Joseph Hager too maintained it was Tashkent, partly based on the striking coincidence of the city being on supposedly the same latitude of 43 degrees north (in fact it

2680-442: The midst of a world of clashing swords, burning towns, and plundered temples." Biruni's writing was very poetic, which may diminish some of the historical value of the work for modern times. The lack of description of battle and politics makes those parts of the picture completely lost. However, many have used Biruni's work to check facts of history in other works that may have been ambiguous or had their validity questioned. Most of

2747-437: The mountain is surrounded by a cemetery . While the mountain remains a prominent and sacred site in the city of Osh, the current state of its infrastructure and museum detracts from its historical significance. Hikers must navigate the steep terrain without the benefit of any shaded areas or access to water, and there are no stands or facilities providing refreshments or basic amenities like toilets. The museum, which dates back to

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2814-468: The other sciences. The Iranian Khwarezmian language , which was Biruni's mother tongue, survived for several centuries after Islam until the Turkification of the region – at least some of the culture of ancient Khwarezm endured – for it is hard to imagine that the commanding figure of Biruni, a repository of so much knowledge, should have appeared in a cultural vacuum. He was sympathetic to

2881-412: The other. There are, however, other reasons which make it impossible. This question is most difficult to solve. The most prominent of both modern and ancient astronomers have deeply studied the question of the moving of the earth, and tried to refute it. We, too, have composed a book on the subject called Miftah-ilm-alhai'a (Key to Astronomy) , in which we think we have surpassed our predecessors, if not in

2948-423: The philosopher Ibn Sina in a multiple letter correspondence. Al-Biruni stated: "Other people, besides, hold this foolish persuasion, that time has no terminus quo at all." He further stated that Aristotle , whose arguments Avicenna uses, contradicted himself when he stated that the universe and matter has a start whilst holding on to the idea that matter is pre-eternal. In his letters to Avicenna, he stated

3015-478: The radius of the Earth using measurements of the height of a hill and measurement of the dip in the horizon from the top of that hill. His calculated radius for the Earth of 3928.77 miles was 2% higher than the actual mean radius of 3847.80 miles. His estimate was given as 12,803,337 cubits , so the accuracy of his estimate compared to the modern value depends on what conversion is used for cubits. The exact length of

3082-524: The reader may learn by the comparative treatment of the subject how much superior the institutions of Islam are, and how more plainly this contrast brings out all customs and usages, differing from those of Islam, in their essential foulness." However he was happy on occasion to express admiration for other cultures, and quoted directly from the sacred texts of other religions when reaching his conclusions. He strove to understand them on their own terms rather than trying to prove them wrong. His underlying concept

3149-957: The reader the theories of the Hindus exactly as they are, and I shall mention in connection with them similar theories of the Greeks in order to show the relationship existing between them. An example of Biruni's analysis is his summary of why many Hindus hate Muslims. Biruni notes in the beginning of his book how the Muslims had a hard time learning about Hindu knowledge and culture. He explains that Hinduism and Islam are totally different from each other. Moreover, Hindus in 11th century India had suffered waves of destructive attacks on many of its cities, and Islamic armies had taken numerous Hindu slaves to Persia, which – claimed Biruni – contributed to Hindus becoming suspicious of all foreigners, not just Muslims. Hindus considered Muslims violent and impure, and did not want to share anything with them. Over time, Biruni won

3216-545: The recalculation of Ptolemy’s coordinates”, concluded that it “can with great probability be identified as Tashkurgan”. Riaz Dean (2022) also uses a new methodology, by proposing a set of four criteria, and three additional reasons based on historical considerations, to locate this landmark, and identifies it as Sulaiman-Too . Sitta von Reden (2023) agrees with Dean that the Stone Tower can be seen in Osh, Kyrgyzstan. All in all, there are four sites that are most often identified as

3283-445: The sciences of his day and was rewarded abundantly for his tireless research in many fields of knowledge. Royalty and other powerful elements in society funded al-Biruni's research and sought him out with specific projects in mind. Influential in his own right, Al-Biruni was himself influenced by the scholars of other nations, such as the Greeks, from whom he took inspiration when he turned to the study of philosophy. A gifted linguist, he

3350-479: The scientific language of his age, but al-Tafhim is one of the most important of the early works of science in Persian , and is a rich source for Persian prose and lexicography . The book covers the Quadrivium in a detailed and skilled fashion. Following Al-Biruni's death, his work was neither built upon or referenced by scholars. Centuries later, his writings about India, which had become of interest to

3417-801: The settlement of Irkeshtam (however, Ptolemy specifically states in his Geography that this station lay 5 degrees further east). All four sites mentioned above, as well as Irkeshtam, can be seen on the Map of Silk Roads over the Roof of Asia and on Map 4 in The Stone Tower: Ptolemy, the Silk Road, and a 2,000-year-old Riddle . Al-Biruni Abu Rayhan Muhammad ibn Ahmad al-Biruni / æ l b ɪ ˈ r uː n i / ( Persian : ابوریحان بیرونی ; Arabic : أبو الريحان البيروني ; 973 – after 1050), known as al-Biruni ,

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3484-570: The specific aspects of Hindu life that Biruni studied was the Hindu calendar . His scholarship on the topic exhibited great determination and focus, not to mention the excellence in his approach of the in-depth research he performed. He developed a method for converting the dates of the Hindu calendar to the dates of the three different calendars that were common in the Islamic countries of his time period,

3551-516: The topic of density, including the different types of densities and how they are measured. His work on the subject was very influential and was later used by scientists like Galileo and Newton in their own research. Bīrūnī devised a novel method of determining the Earth's radius by means of the observation of the height of a mountain. He carried it out at Nandana in Pind Dadan Khan (present-day Pakistan). He used trigonometry to calculate

3618-596: The true value. In his Codex Masudicus (1037), Al-Biruni theorized the existence of a landmass along the vast ocean between Asia and Europe, or what is today known as the Americas. He argued for its existence on the basis of his accurate estimations of the Earth's circumference and Afro-Eurasia 's size, which he found spanned only two-fifths of the Earth's circumference, reasoning that the geological processes that gave rise to Eurasia must surely have given rise to lands in

3685-480: The use of harsh LED lighting throughout the museum further diminishes the atmosphere, making the experience less immersive and educational. The site would greatly benefit from restoration efforts, better curation, and the addition of essential facilities to preserve its heritage and enhance the visitor experience. This Osh Region location article is a stub . You can help Misplaced Pages by expanding it . This Asia mountain, mountain range, or peak related article

3752-605: The vast ocean between Asia and Europe. He also theorized that at least some of the unknown landmass would lie within the known latitudes which humans could inhabit, and therefore would be inhabited. Biruni wrote a pharmacopoeia , the Kitab al-saydala fi al-tibb (" Book on the Pharmacopoeia of Medicine "). It lists synonyms for drug names in Syriac, Persian, Greek, Baluchi, Afghan, Kurdi, and some Indian languages. He used

3819-478: The welcome of Hindu scholars. Al-Biruni collected books and studied with these Hindu scholars to become fluent in Sanskrit, discover and translate into Arabic the mathematics, science, medicine, astronomy and other fields of arts as practiced in 11th-century India. He was inspired by the arguments offered by Indian scholars who believed earth must be globular in shape, which they felt was the only way to fully explain

3886-582: The words, at all events in the matter. In his major astronomical work, the Mas'ud Canon , Biruni observed that, contrary to Ptolemy , the Sun's apogee (highest point in the heavens) was mobile, not fixed. He wrote a treatise on the astrolabe , describing how to use it to tell the time and as a quadrant for surveying. One particular diagram of an eight-geared device could be considered an ancestor of later Muslim astrolabes and clocks. More recently, Biruni's eclipse data

3953-633: The works of Al-Biruni are in Arabic although he seemingly wrote the Kitab al-Tafhim in both Persian and Arabic, showing his mastery over both languages. Bīrūnī's catalogue of his own literary production up to his 65th lunar/63rd solar year (the end of 427/1036) lists 103 titles divided into 12 categories: astronomy, mathematical geography, mathematics, astrological aspects and transits, astronomical instruments, chronology, comets, an untitled category, astrology, anecdotes, religion, and books he no longer possesses. Biruni wrote most of his works in Arabic ,

4020-497: Was a Khwarazmian Iranian scholar and polymath during the Islamic Golden Age . He has been called variously "Father of Comparative Religion ", "Father of modern geodesy ", Founder of Indology and the first anthropologist . Al-Biruni was well versed in physics , mathematics, astronomy , and natural sciences , and also distinguished himself as a historian, chronologist , and linguist . He studied almost all

4087-430: Was able to measure the density of many different substances, including precious metals, gems, and even air. He also used this method to determine the radius of the earth, which he did by measuring the angle of elevation of the horizon from the top of a mountain and comparing it to the angle of elevation of the horizon from a nearby plain. In addition to developing the hydrostatic balance, Al-Biruni also wrote extensively on

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4154-708: Was conversant in Khwarezmian , Persian , Arabic, and Sanskrit , and also knew Greek , Hebrew , and Syriac . He spent much of his life in Ghazni , then capital of the Ghaznavids , in modern-day central-eastern Afghanistan. In 1017, he travelled to the Indian subcontinent and wrote a treatise on Indian culture entitled Tārīkh al-Hind (" The History of India "), after exploring the Hindu faith practiced in India. He was, for his time, an admirably impartial writer on

4221-496: Was remarkable for its time. He stated that he was fully objective in his writings, remaining unbiased like a proper historian should. Biruni documented everything about India just as it happened. But, he did note how some of the accounts of information that he was given by natives of the land may not have been reliable in terms of complete accuracy, however, he did try to be as honest as possible in his writing. Eduard Sachau compares it to "a magic island of quiet, impartial research in

4288-440: Was that all cultures are at least distant relatives of all other cultures because they are all human constructs. "Rather, what Al-Biruni seems to be arguing is that there is a common human element in every culture that makes all cultures distant relatives, however foreign they might seem to one another." Al-Biruni divides Hindus into an educated and an uneducated class. He describes the educated as monotheistic, believing that God

4355-614: Was the area Ptolemy referred to “when the traveller ascended the ravine” and so proposed a site near Daraut-Kurgan, and J. Oliver Thomson agrees it should be nearby. From the turn of this century, Claude Rapin (2001) has suggested it is Sulaiman-Too; while Paul Bernard (2005), by carefully tracing the route taken by the caravan of Maes Titianos , locates the Stone Tower near Daraut-Kurgan; and Igor Vasilevich Piankov (2014), after also considering information drawn from contemporary sailors, agrees with him. Irina Tupikova et al. (2014), following “the application of spherical trigonometry for

4422-402: Was the most important landmark on this route, where caravans stopped on their difficult and dangerous journeys to allow travellers to take on provisions, rest, and trade goods before continuing on. Ptolemy's famous treatise on cartography, Geography , was written around 140 CE, comprising eight books, and is the only text on this subject to have survived from classical antiquity. It has had

4489-529: Was used by Dunthorne in 1749 to help determine the acceleration of the Moon , and his data on equinox times and eclipses was used as part of a study of Earth's past rotation. Like later adherents of the Ash'ari school, such as al-Ghazali , al-Biruni is famous for vehemently defending the majority Sunni position that the universe had a beginning, being a strong supporter of creatio ex nihilo , specifically refuting

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