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60-548: In Ancient Indian astronomy , there are 27 nakshatras , or sectors along the ecliptic . A list of them is first found in the Vedanga Jyotisha , a text dated to the final centuries BCE. The Nakṣatra system predates the influence of Hellenistic astronomy on Vedic tradition, which became prevalent from about the 2nd century CE. There are various systems of enumerating the Nakṣatra -s; although there are 27-28 days to

120-483: A Greek origin for certain aspects of Indian astronomy. One of the direct proofs for this approach is the fact quoted that many Sanskrit words related to astronomy, astrology and calendar are either direct phonetical borrowings from the Greek language, or translations, assuming complex ideas, like the names of the days of the week which presuppose a relation between those days, planets (including Sun and Moon) and gods. With

180-566: A Japa mala, indicating all the elements (ansh) of Vishnu: The names of nakshatras in other languages are adapted from the Sanskrit variation (apabhramsa) through Pali or Prakrit. The variations evolved for easier pronunciation in popular usage. Burmese နက္ခတ် Indian astronomy Indian astronomy refers to astronomy practiced in the Indian subcontinent . It has a long history stretching from pre-historic to modern times . Some of

240-673: A Persian treatise on astronomy. He wrote about the heliocentric model, and argued that there exists an infinite number of universes ( awalim ), each with their own planets and stars, and that this demonstrates the omnipotence of God, who is not confined to a single universe. The last known Zij treatise was the Zij-i Bahadurkhani , written in 1838 by the Indian astronomer Ghulam Hussain Jaunpuri (1760–1862) and printed in 1855, dedicated to Bahadur Khan . The treatise incorporated

300-593: A committee to look into the trial and Galileo was pardoned.   Isaac Newton was a Catholic. After coming to the conclusion that the Holy Trinity could not exist due to the fact that Jesus couldn't be equal to God, Newton chose to not become a minister. He still believed in the Bible so much so that the idea of going against the first commandment was worse than walking away from Cambridge . Newton didn't believe religion and science were mutually exclusive and used

360-453: A horizontal plane in order to ascertain the cardinal directions, the latitude of the point of observation, and the time of observation. This device finds mention in the works of Varāhamihira, Āryabhata, Bhāskara, Brahmagupta, among others. The Cross-staff , known as Yasti-yantra , was used by the time of Bhaskara II (1114–1185 CE). This device could vary from a simple stick to V-shaped staffs designed specifically for determining angles with

420-410: A nocturnal polar rotation instrument consisted of a rectangular board with a slit and a set of pointers with concentric graduated circles. Time and other astronomical quantities could be calculated by adjusting the slit to the directions of α and β Ursa Minor . Ōhashi (2008) further explains that: "Its backside was made as a quadrant with a plumb and an index arm. Thirty parallel lines were drawn inside

480-541: A number of observations were carried out". Following the arrival of the British East India Company in the 18th century, the Hindu and Islamic traditions were slowly displaced by European astronomy, though there were attempts at harmonising these traditions. The Indian scholar Mir Muhammad Hussain had travelled to England in 1774 to study Western science and, on his return to India in 1777, he wrote

540-626: A personal observatory near Delhi , while Jahangir and Shah Jahan were also intending to build observatories but were unable to do so. After the decline of the Mughal Empire, it was a Hindu king, Jai Singh II of Amber , who attempted to revive both the Islamic and Hindu traditions of astronomy which were stagnating in his time. In the early 18th century, he built several large observatories called Yantra Mandirs in order to rival Ulugh Beg 's Samarkand observatory and in order to improve on

600-481: A sidereal month, by custom only 27 days are used. The following list gives the corresponding regions of sky. Months in the modern Indian national calendar -- despite still carrying names that derive from the nakshatras -- do not signify any material correlation. It stands to reason that during the original naming of these months -- whenever that happened -- they were indeed based on the nakshatras that coincided with them in some manner. The modern Indian national calendar

660-558: A wheel with 12 parts and 360 spokes (days), with a remainder of 5, making reference to the solar calendar. As in other traditions, there is a close association of astronomy and religion during the early history of the science, astronomical observation being necessitated by spatial and temporal requirements of correct performance of religious ritual. Thus, the Shulba Sutras , texts dedicated to altar construction, discusses advanced mathematics and basic astronomy. Vedanga Jyotisha

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720-459: Is a solar calendar, much like the Gregorian calendar wherein solstices and equinoxes fall on the same date(s) every year. The 27 Nakshatras cover 13°20’ of the ecliptic each. Each Nakshatra is also divided into quarters or padas of 3°20’, and the below table lists the appropriate starting sound to name the child. The 27 nakshatras, each with 4 padas, give 108, which is the number of beads in

780-643: Is another of the earliest known Indian texts on astronomy, it includes the details about the Sun, Moon, nakshatras , lunisolar calendar . The Vedanga Jyotisha describes rules for tracking the motions of the Sun and the Moon for the purposes of ritual. According to the Vedanga Jyotisha, in a yuga or "era", there are 5 solar years, 67 lunar sidereal cycles, 1,830 days, 1,835 sidereal days and 62 synodic months. Greek astronomical ideas began to enter India in

840-679: Is in a flourishing state." Another Indian text, the Gargi-Samhita , also similarly compliments the Yavanas (Greeks) noting they, though barbarians, must be respected as seers for their introduction of astronomy in India. Indian astronomy reached China with the expansion of Buddhism during the Later Han (25–220 CE). Further translation of Indian works on astronomy was completed in China by

900-472: Is not extant. The text today known as Surya Siddhanta dates to the Gupta period and was received by Aryabhata . The classical era of Indian astronomy begins in the late Gupta era, in the 5th to 6th centuries. The Pañcasiddhāntikā by Varāhamihira (505 CE) approximates the method for determination of the meridian direction from any three positions of the shadow using a gnomon . By the time of Aryabhata

960-708: The Defence Research and Development Organisation and the Indian Space Research Organisation's (ISRO) civilian space programme and launch vehicle technology. Bhaba established the Tata Institute of Fundamental Research and Vikram Sarabhai established the Physical Research Laboratory . These organisations researched cosmic radiation and conducted studies of the upper atmosphere . In 1950,

1020-735: The Department of Atomic Energy was founded with Bhaba as secretary and provided funding to space researches in the country. The Indian National Committee for Space Research (INCOSPAR) was founded in 1962 on the urging of Sarabhai. ISRO succeeded INCOSPAR and the Department of Space (under Indira Gandhi ) was established, thereby institutionalising astronomical research in India. Organisations like SPARRSO in Bangladesh, SUPARCO in Pakistan and others were founded shortly after. Astronomy and religion In many ancient religions,

1080-643: The Latin translations of the 12th century , Muhammad al-Fazari 's Great Sindhind (based on the Surya Siddhanta and the works of Brahmagupta ), was translated into Latin in 1126 and was influential at the time. Many Indian works on astronomy and astrology were translated into Middle Persian in Gundeshapur the Sasanian Empire and later translated from Middle Persian into Arabic. In

1140-544: The Mauryan Empire , and the later expansion of the Indo-Greeks into India suggest that transmission of Greek astronomical ideas to India occurred during this period. The Greek concept of a spherical Earth surrounded by the spheres of planets, further influenced the astronomers like Varahamihira and Brahmagupta . Several Greco-Roman astrological treatises are also known to have been exported to India during

1200-568: The Three Kingdoms era (220–265 CE). However, the most detailed incorporation of Indian astronomy occurred only during the Tang dynasty (618–907 CE) when a number of Chinese scholars—such as Yi Xing — were versed both in Indian and Chinese astronomy . A system of Indian astronomy was recorded in China as Jiuzhi-li (718 CE), the author of which was an Indian by the name of Qutan Xida —a translation of Devanagari Gotama Siddha—the director of

1260-573: The calendars in India: The oldest system, in many respects the basis of the classical one, is known from texts of about 1000 BCE. It divides an approximate solar year of 360 days into 12 lunar months of 27 (according to the early Vedic text Taittirīya Saṃhitā 4.4.10.1–3) or 28 (according to the Atharvaveda , the fourth of the Vedas, 19.7.1.) days. The resulting discrepancy was resolved by

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1320-470: The 17th century, the Mughal Empire saw a synthesis between Islamic and Hindu astronomy, where Islamic observational instruments were combined with Hindu computational techniques. While there appears to have been little concern for planetary theory, Muslim and Hindu astronomers in India continued to make advances in observational astronomy and produced nearly a hundred Zij treatises. Humayun built

1380-705: The 4th century BCE following the conquests of Alexander the Great . By the early centuries of the Common Era, Indo-Greek influence on the astronomical tradition is visible, with texts such as the Yavanajataka and Romaka Siddhanta . Later astronomers mention the existence of various siddhantas during this period, among them a text known as the Surya Siddhanta . These were not fixed texts but rather an oral tradition of knowledge, and their content

1440-628: The 6th century, the Romaka Siddhanta ("Doctrine of the Romans"), and the Paulisa Siddhanta ("Doctrine of Paul ") were considered as two of the five main astrological treatises, which were compiled by Varāhamihira in his Pañca-siddhāntikā ("Five Treatises"), a compendium of Greek, Egyptian, Roman and Indian astronomy. Varāhamihira goes on to state that "The Greeks, indeed, are foreigners, but with them this science (astronomy)

1500-473: The Bible as a guide for his work. Despite his desire to connect the science to the scripture, he was attacked by society and the church in his writing of the Principia when he was studying astronomy and soon delved into other works after being incapable of handling the criticism from his peers. Newton turned to alchemy using Greek myths to guide his work and became known less for his work in astronomy creating

1560-543: The Copernican theory henceforth condemning the works of Galileo. If the science did not back up scripture, then it was not to be taught. By 1633, Galileo's new best-seller Dialogue Concerning the Two Chief World Systems had been prohibited. He recanted his heliocentrism and was sentenced to home arrest for the rest of his life. Four hundred years after Galileo's death, Pope John Paul II set up

1620-762: The Kerala school (active 1380 to 1632) involved higher order polynomials and other cutting-edge algebra; many neatly were put to use, principally for predicting motions and alignments within the Solar System. During 1920, astronomers like Sisir Kumar Mitra , C.V. Raman and Meghnad Saha worked on various projects such as sounding of the ionosphere through ground-based radio and the Saha ionisation equation . Homi J. Bhaba and Vikram Sarabhai made significant contributions. A. P. J. Abdul Kalam also known as Missile Man of India assisted in development and research for

1680-404: The Sun inferred from the Moon's position at Full Moon, when the Sun is on the opposite side of the Moon. The position of the Sun at midnight was calculated from the nakṣatra that culminated on the meridian at that time, the Sun then being in opposition to that nakṣatra . Among the devices used for astronomy was gnomon , known as Sanku , in which the shadow of a vertical rod is applied on

1740-575: The Tang dynasty's national astronomical observatory. Fragments of texts during this period indicate that Arabs adopted the sine function (inherited from Indian mathematics) instead of the chords of arc used in Hellenistic mathematics . Another Indian influence was an approximate formula used for timekeeping by Muslim astronomers . Through Islamic astronomy, Indian astronomy had an influence on European astronomy via Arabic translations. During

1800-426: The armillary sphere was composed between 1380 and 1460 CE by Parameśvara . On the subject of the usage of the armillary sphere in India, Ōhashi (2008) writes: "The Indian armillary sphere ( gola-yantra ) was based on equatorial coordinates, unlike the Greek armillary sphere, which was based on ecliptical coordinates, although the Indian armillary sphere also had an ecliptical hoop. Probably, the celestial coordinates of

1860-665: The astronomical tables compiled by Philippe de La Hire in 1702. After examining La Hire's work, Jai Singh concluded that the observational techniques and instruments used in European astronomy were inferior to those used in India at the time – it is uncertain whether he was aware of the Copernican Revolution via the Jesuits. He did, however, employ the use of telescopes . In his Zij-i Muhammad Shahi , he states: "telescopes were constructed in my kingdom and using them

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1920-640: The center of the universe thus moving the Earth out of the center took away from the greatness of his creation The Sidereus Nuncius written by Galileo in 1610, approved by the Holy Office , attracted much attention. This writing documented his observations using the telescope, describing the Moons of Jupiter and the mountains of the Moon. By 1616 the Holy Office also known as the Inquisition condemned

1980-460: The discoveries they made following the invention of the telescope. Heliocentrism is the idea that the sun is the center of the universe, and all the planets revolve around it. This is opposite to geocentrism in which the Earth is the center of the universe with the sun and all the other planets revolve around it. The geocentric model was the widely accepted model during the times of Plato , Aristotle , Ptolemy , and other astronomers. This model

2040-635: The earlier Hindu computations in the Siddhantas and Islamic observations in Zij-i-Sultani . The instruments he used were influenced by Islamic astronomy, while the computational techniques were derived from Hindu astronomy. Some scholars have suggested that knowledge of the results of the Kerala school of astronomy and mathematics may have been transmitted to Europe through the trade route from Kerala by traders and Jesuit missionaries. Kerala

2100-471: The earliest roots of Indian astronomy can be dated to the period of Indus Valley civilisation or earlier. Astronomy later developed as a discipline of Vedanga , or one of the "auxiliary disciplines" associated with the study of the Vedas dating 1500 BCE or older. The oldest known text is the Vedanga Jyotisha , dated to 1400–1200 BCE (with the extant form possibly from 700 to 600 BCE). Indian astronomy

2160-515: The eighteenth century. The observatory in Mathura is not extant, but those in Delhi, Jaipur , Ujjain , and Banaras are. There are several huge instruments based on Hindu and Islamic astronomy. For example, the samrāt.-yantra (emperor instrument) is a huge sundial which consists of a triangular gnomon wall and a pair of quadrants toward the east and west of the gnomon wall. Time has been graduated on

2220-519: The established religious beliefs. Although acquitted, he was forced to go into retirement. As science expanded during the Renaissance , the secular beliefs of scientific investigators encountered the opposition of Christian orthodoxy. The most famous such conflict was that of Galileo Galilei , who was tried by the Inquisition on suspicion of heresy. However, many astronomers were also highly religious and attempted to reconcile their beliefs with

2280-417: The events on the earth and in the heavens led to the development of astrology . The first recorded conflict between religious orthodoxy and astronomy occurred with the Greek astronomer Anaxagoras . His beliefs that the heavenly bodies were the result of an evolutionary process and that the sun was a great burning stone (rather than the deity Helios ), resulted in his arrest. He was charged with contravening

2340-575: The first few centuries of the present era. The Yavanajataka is a Sanskrit text of the 3rd century CE on Greek horoscopy and mathematical astronomy. Rudradaman 's capital at Ujjain "became the Greenwich of Indian astronomers and the Arin of the Arabic and Latin astronomical treatises; for it was he and his successors who encouraged the introduction of Greek horoscopy and astronomy into India." Later in

2400-669: The heliocentric system into the Zij tradition. Jantar (means yantra, machine); mantar (means calculate). Jai Singh II in the 18th century took great interest in science and astronomy. He made various Jantar Mantars in Jaipur , Delhi , Ujjain , Varanasi and Mathura . The Jaipur instance has 19 different astronomical calculators. These comprise live and forward-calculating astronomical clocks (calculators) for days, eclipses, visibility of key constellations which are not year-round northern polar ones thus principally but not exclusively those of

2460-450: The help of a calibrated scale. The clepsydra ( Ghatī-yantra ) was used in India for astronomical purposes until recent times. Ōhashi (2008) notes that: "Several astronomers also described water-driven instruments such as the model of fighting sheep." The armillary sphere was used for observation in India since early times, and finds mention in the works of Āryabhata (476 CE). The Goladīpikā —a detailed treatise dealing with globes and

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2520-444: The intercalation of a leap month every 60 months. Time was reckoned by the position marked off in constellations on the ecliptic in which the Moon rises daily in the course of one lunation (the period from New Moon to New Moon) and the Sun rises monthly in the course of one year. These constellations ( nakṣatra ) each measure an arc of 13° 20 ′ of the ecliptic circle. The positions of the Moon were directly observable, and those of

2580-499: The junction stars of the lunar mansions were determined by the armillary sphere since the seventh century or so. There was also a celestial globe rotated by flowing water." An instrument invented by the mathematician and astronomer Bhaskara II (1114–1185 CE) consisted of a rectangular board with a pin and an index arm. This device—called the Phalaka-yantra —was used to determine time from the Sun's altitude. The Kapālayantra

2640-478: The medieval period and into the 16th or 17th century, especially within the Kerala school of astronomy and mathematics . Some of the earliest forms of astronomy can be dated to the period of Indus Valley civilisation , or earlier. Some cosmological concepts are present in the Vedas , as are notions of the movement of heavenly bodies and the course of the year. The Rig Veda is one of the oldest pieces of Indian literature. Rig Veda 1-64-11 & 48 describes time as

2700-412: The motion of planets was treated to be elliptical rather than circular. Other topics included definitions of different units of time, eccentric models of planetary motion, epicyclic models of planetary motion, and planetary longitude corrections for various terrestrial locations. The divisions of the year were on the basis of religious rites and seasons ( Ṛtú ). The duration from mid March—mid May

2760-451: The need to keep accurate time led to more careful tracking of the positions of the sun, moon and planets; resulting with their deification when they became inextricably linked with the means of survival. In the ancient Egyptian calendar , the date of the annual flooding of the Nile was predicted by observing the heliacal rising of a star. Indeed, the belief in a strong association between

2820-533: The northern circumpolar stars were associated with darkness, death and the underworld of the dead. For the Aztecs , the northern stars were associated with Tezcatlipoca . In Peking , China, was a shrine devoted to the North Star deity . Such worship of the northern stars may have been associated with time keeping, as the positions of the stars could identify the annual seasons. Likewise, as agriculture developed,

2880-431: The only examples of seamless metal globes. These Mughal metallurgists developed the method of lost-wax casting in order to produce these globes. According to David Pingree , there are a number of Indian astronomical texts dated to the sixth century CE or later with a high degree of certainty. There is substantial similarity between these and pre-Ptolemaic Greek astronomy. Pingree believes that these similarities suggest

2940-409: The quadrant, and trigonometrical calculations were done graphically. After determining the sun's altitude with the help of the plumb, time was calculated graphically with the help of the index arm." Ōhashi (2008) reports on the observatories constructed by Jai Singh II of Amber : The Mahārāja of Jaipur, Sawai Jai Singh (1688–1743 CE), constructed five astronomical observatories at the beginning of

3000-510: The quadrants. The seamless celestial globe invented in Mughal India , specifically Lahore and Kashmir , is considered to be one of the most impressive astronomical instruments and remarkable feats in metallurgy and engineering. All globes before and after this were seamed, and in the 20th century, it was believed by metallurgists to be technically impossible to create a metal globe without any seams , even with modern technology. It

3060-547: The rise of Greek culture in the east , Hellenistic astronomy filtered eastwards to India, where it profoundly influenced the local astronomical tradition. For example, Hellenistic astronomy is known to have been practised near India in the Greco-Bactrian city of Ai-Khanoum from the 3rd century BCE. Various sun-dials, including an equatorial sundial adjusted to the latitude of Ujjain have been found in archaeological excavations there. Numerous interactions with

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3120-565: The shape of ellipses . These models were not accepted by society which at the time was dominated by the Catholic religion and these astronomers received harsh criticism both the church and those around them. The argument by Tammaso Cassini was that the bible did not support the Earth revolving around the Sun. One example provided was in Joshua 10 when God stopped the Sun for Joshua. It was also argued that God would place his greatest creation at

3180-551: The time. The Aryabhatiya is composed of four sections, covering topics such as units of time, methods for determining the positions of planets, the cause of day and night, and several other cosmological concepts. Later, Indian astronomy significantly influenced Muslim astronomy , Chinese astronomy , European astronomy and others. Other astronomers of the classical era who further elaborated on Aryabhata's work include Brahmagupta , Varahamihira and Lalla . An identifiable native Indian astronomical tradition remained active throughout

3240-411: The zodiac. Astronomers abroad were invited and admired complexity of certain devices. As brass time-calculators are imperfect, and to help in their precise re-setting so as to match true locally experienced time, there remains equally his Samrat Yantra, the largest sundial in the world. It divides each daylit hour as to solar 15-minute, 1-minute and 6-second subunits. Other notable include: Models of

3300-475: Was an equatorial sundial instrument used to determine the Sun's azimuth . Kartarī-yantra combined two semicircular board instruments to give rise to a 'scissors instrument'. Introduced from the Islamic world and first finding mention in the works of Mahendra Sūri —the court astronomer of Firuz Shah Tughluq (1309–1388 CE)—the astrolabe was further mentioned by Padmanābha (1423 CE) and Rāmacandra (1428 CE) as its use grew in India. Invented by Padmanābha ,

3360-467: Was in continuous contact with China, Arabia and Europe. The existence of circumstantial evidence such as communication routes and a suitable chronology certainly make such a transmission a possibility. However, there is no direct evidence by way of relevant manuscripts that such a transmission took place. In the early 18th century, Jai Singh II of Amber invited European Jesuit astronomers to one of his Yantra Mandir observatories, who had bought back

3420-627: Was in the 1980s, however, that Emilie Savage-Smith discovered several celestial globes without any seams in Lahore and Kashmir. The earliest was invented in Kashmir by Ali Kashmiri ibn Luqman in 1589–90 CE during Akbar the Great 's reign; another was produced in 1659–60 CE by Muhammad Salih Tahtawi with Arabic and Sanskrit inscriptions; and the last was produced in Lahore by a Hindu metallurgist Lala Balhumal Lahuri in 1842 during Jagatjit Singh Bahadur 's reign. 21 such globes were produced, and these remain

3480-415: Was influenced by Greek astronomy beginning in the 4th century BCE and through the early centuries of the Common Era, for example by the Yavanajataka and the Romaka Siddhanta , a Sanskrit translation of a Greek text disseminated from the 2nd century. Indian astronomy flowered in the 5th–6th century, with Aryabhata , whose work, Aryabhatiya , represented the pinnacle of astronomical knowledge at

3540-425: Was rooted in observations made by astronomers at the time as well as being rooted in religion. Nicolaus Copernicus followed by astronomers such as Galileo Galilei and Johannes Kepler suggested a different model with the sun at the center of the universe. This model was also based on observation but incorporated the use of the newly created telescope as well as several mathematical observations creating orbits in

3600-475: Was taken to be spring ( vasanta ), mid May—mid July: summer ( grishma ), mid July—mid September: rains ( varsha ), mid September—mid November: autumn ( sharada ), mid November—mid January: winter ( hemanta ), mid January—mid March: the dews ( shishira ). In the Vedānga Jyotiṣa , the year begins with the winter solstice. Hindu calendars have several eras : J.A.B. van Buitenen (2008) reports on

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