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词条 Indian astronomy
释义

  1. History

  2. Calendars

  3. Astronomers

  4. Instruments used

  5. Global discourse

     Indian and Greek astronomy  Indian and Chinese astronomy  Indian and Islamic astronomy  Indian astronomy and Europe 

  6. See also

  7. Further reading

  8. Notes

  9. References

{{EngvarB|date=March 2015}}{{Use dmy dates|date=March 2013}}{{Science and technology in India}}Indian astronomy has a long history stretching from pre-historic to modern times. Some of the earliest roots of Indian astronomy can be dated to the period of Indus Valley Civilization or earlier.[1][2] Astronomy later developed as a discipline of Vedanga or one of the "auxiliary disciplines" associated with the study of the Vedas,[3] dating 1500 BCE or older.[4] The oldest known text is the Vedanga Jyotisha, dated to 1400–1200 BCE (with the extant form possibly from 700–600 BCE).[5]Greek astronomy was influenced by Indian astronomy and vice versa beginning in the 4th century BCE[6][7][8] and through the early centuries of the Common Era, for example by the Yavanajataka[6] and the Romaka Siddhanta, a Sanskrit translation of a Greek text disseminated from the 2nd century.[9]

Indian astronomy flowered in the 5th–6th century, with Aryabhata, whose Aryabhatiya represented the pinnacle of astronomical knowledge at the time. Later the Indian astronomy significantly influenced Muslim astronomy, Chinese astronomy, European astronomy,[10] 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 the medieval period and into the 16th or 17th century, especially within the Kerala school of astronomy and mathematics.

History

Some of the earliest forms of astronomy can be dated to the period of Indus Valley Civilization, or earlier.[1][2] Some cosmological concepts are present in the Vedas, as are notions of the movement of heavenly bodies and the course of the year.[3]

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.[15] Vedanga Jyotisha is another of the earliest known Indian texts on astronomy,[11] it includes the details about the Sun, Moon, nakshatras, lunisolar calendar.[12][13]

Greek astronomical ideas began to enter India in the 4th century BCE following the conquests of Alexander the Great.[6][7][8][14] By the early centuries of the Common Era, Indo-Greek influence on the astronomical tradition is visible, with texts such as the Yavanajataka[6] and Romaka Siddhanta.[9]

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 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.[15] By the time of Aryabhata the motion of planets was treated to be elliptical rather than circular.[15] 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.[15]

Calendars

{{Further information|Hindu calendar}}

The divisions of the year were on the basis of religious rites and seasons (Rtu).[16] The duration from mid March—Mid May was taken to be spring (vasanta), mid May—mid July: summer ("grishma"), mid July—mid September: rains (varsha), mid September—mid November: autumn, mid November—mid January: winter, mid January—mid March: dew (śiśira).[16]

In the {{IAST|Vedānga Jyotiṣa}}, the year begins with the winter solstice.[17] Hindu calendars have several eras:

  • The Hindu calendar, counting from the start of the Kali Yuga, has its epoch on 18 February 3102 BCE Julian (23 January 3102 BCE Gregorian).
  • The Vikrama Samvat calendar, introduced about the 12th century, counts from 56–57 BCE.
  • The "Saka Era", used in some Hindu calendars and in the Indian national calendar, has its epoch near the vernal equinox of year 78.
  • The Saptarshi calendar traditionally has its epoch at 3076 BCE.[18]

J.A.B. van Buitenen (2008) reports on the calendars in India:

{{Quotation|1=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 {{IAST|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 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 ({{IAST|nakṣatra}}) each measure an arc of 13° 20′ of the ecliptic circle. The positions of the Moon were directly observable, and those of 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 {{IAST|nakṣatra}} that culminated on the meridian at that time, the Sun then being in opposition to that {{IAST|nakṣatra}}.[16]}}

Astronomers

Name Year Contributions
Lagadha 1st millennium BCE {{IAST>Vedānga Jyotiṣa}} details several astronomical attributes generally applied for timing social and religious events.[33] The {{IAST|Vedānga Jyotiṣa}} also details astronomical calculations, calendrical studies, and establishes rules for empirical observation.[19] Since the texts written by 1200 BCE were largely religious compositions the {{IAST|Vedānga Jyotiṣa}} has connections with Indian astrology and details several important aspects of the time and seasons, including lunar months, solar months, and their adjustment by a lunar leap month of Adhimāsa.[20] Ritus are also described as ((yugams)).[20] Tripathi (2008) holds that ' Twenty-seven constellations, eclipses, seven planets, and twelve signs of the zodiac were also known at that time.'[20]
Aryabhata 476–550 CE Aryabhata was the author of the Āryabhatīya and the Aryabhatasiddhanta, which, according to Hayashi (2008): 'circulated mainly in the northwest of India and, through the Sāsānian dynasty (224–651) of Iran, had a profound influence on the development of Islamic astronomy. Its contents are preserved to some extent in the works of Varahamihira (flourished c. 550), Bhaskara I (flourished c. 629), Brahmagupta (598–c. 665), and others. It is one of the earliest astronomical works to assign the start of each day to midnight.'[15] Aryabhata explicitly mentioned that the Earth rotates about its axis, thereby causing what appears to be an apparent westward motion of the stars.[15] In his book, Aryabhatiya, he suggested that the Earth was sphere, containing a circumference of 24,835 miles (39,967 km).[21] Aryabhata also mentioned that reflected sunlight is the cause behind the shining of the Moon.[15] Aryabhata's followers were particularly strong in South India, where his principles of the diurnal rotation of the Earth, among others, were followed and a number of secondary works were based on them.[3]
Brahmagupta 598–668 CE Brahmasphuta-siddhanta (Correctly Established Doctrine of Brahma, 628 CE) dealt with both Indian mathematics and astronomy. Hayashi (2008) writes: 'It was translated into Arabic in Baghdad about 771 and had a major impact on Islamic mathematics and astronomy.'[22] In Khandakhadyaka (A Piece Eatable, 665 CE) Brahmagupta reinforced Aryabhata's idea of another day beginning at midnight.[22] Brahmagupta also calculated the instantaneous motion of a planet, gave correct equations for parallax, and some information related to the computation of eclipses.[3] His works introduced Indian concept of mathematics based astronomy into the Arab world.[3] He also theorized that all bodies with mass are attracted to the earth.[23]
Varāhamihira 505 CE Varāhamihira was an astronomer and mathematician who studied and Indian astronomy as well as the many principles of Greek, Egyptian, and Roman astronomical sciences.[48] His Pañcasiddhāntikā is a treatise and compendium drawing from several knowledge systems.[24]
Bhāskara I 629 CE Authored the astronomical works Mahabhaskariya (Great Book of Bhaskara), Laghubhaskariya (Small Book of Bhaskara), and the Aryabhatiyabhashya (629 CE)—a commentary on the Āryabhatīya written by Aryabhata.[50] Hayashi (2008) writes 'Planetary longitudes, heliacal rising and setting of the planets, conjunctions among the planets and stars, solar and lunar eclipses, and the phases of the Moon are among the topics Bhāskara discusses in his astronomical treatises.'[25] Bhāskara I's works were followed by Vateśvara (880 CE), who in his eight chapter Vateśvarasiddhānta devised methods for determining the parallax in longitude directly, the motion of the equinoxes and the solstices, and the quadrant of the sun at any given time.[3]
Lalla 8th century CE Author of the Śisyadhīvrddhida (Treatise Which Expands the Intellect of Students), which corrects several assumptions of Āryabhata.[53] The Śisyadhīvrddhida of Lalla itself is divided into two parts:Grahādhyāya and Golādhyāya.[53] Grahādhyāya (Chapter I-XIII) deals with planetary calculations, determination of the mean and true planets, three problems pertaining to diurnal motion of Earth, eclipses, rising and setting of the planets, the various cusps of the Moon, planetary and astral conjunctions, and complementary situations of the Sun and the Moon.[26] The second part—titled Golādhyāya (chapter XIV–XXII)—deals with graphical representation of planetary motion, astronomical instruments, spherics, and emphasizes on corrections and rejection of flawed principles.[26] Lalla shows influence of Āryabhata, Brahmagupta, and Bhāskara I.[26] His works were followed by later astronomers Śrīpati, Vateśvara, and Bhāskara II.[26] Lalla also authored the Siddhāntatilaka.[26]
Bhāskara II 1114 CE {{IAST>Siddhāntaśiromaṇi}} (Head Jewel of Accuracy) and {{IAST|Karaṇakutūhala}} (Calculation of Astronomical Wonders) and reported on his observations of planetary positions, conjunctions, eclipses, cosmography, geography, mathematics, and astronomical equipment used in his research at the observatory in Ujjain, which he headed.[27]
Śrīpati 1045 CE Śrīpati was an astronomer and mathematician who followed the Brhmagupta school and authored the Siddhāntaśekhara (The Crest of Established Doctrines) in 20 chapters, thereby introducing several new concepts, including Moon's second inequality.[3][28]
Mahendra Suri 14th century CE Mahendra Suri authored the Yantra-rāja (The King of Instruments, written in 1370 CE)—a Sanskrit work on the astrolabe, itself introduced in India during the reign of the 14th century Tughlaq dynasty ruler Firuz Shah Tughluq (1351–1388 CE).[63] Suri seems to have been a Jain astronomer in the service of Firuz Shah Tughluq.[63] The 182 verse Yantra-rāja mentions the astrolabe from the first chapter onwards, and also presents a fundamental formula along with a numerical table for drawing an astrolabe although the proof itself has not been detailed.[63] Longitudes of 32 stars as well as their latitudes have also been mentioned.[63] Mahendra Suri also explained the Gnomon, equatorial co-ordinates, and elliptical co-ordinates.[63] The works of Mahendra Suri may have influenced later astronomers like Padmanābha (1423 CE)—author of the Yantra-rāja-adhikāra, the first chapter of his Yantra-kirnāvali.[29]
Nilakanthan Somayaji 1444–1544 CE In 1500, Nilakanthan Somayaji of the Kerala school of astronomy and mathematics, in his Tantrasangraha, revised Aryabhata's model for the planets Mercury and Venus. His equation of the centre for these planets remained the most accurate until the time of Johannes Kepler in the 17th century.[30] Nilakanthan Somayaji, in his Aryabhatiyabhasya, a commentary on Aryabhata's Aryabhatiya, developed his own computational system for a partially heliocentric planetary model, in which Mercury, Venus, Mars, Jupiter and Saturn orbit the Sun, which in turn orbits the Earth, similar to the Tychonic system later proposed by Tycho Brahe in the late 16th century. Nilakantha's system, however, was mathematically more efficient than the Tychonic system, due to correctly taking into account the equation of the centre and latitudinal motion of Mercury and Venus. Most astronomers of the Kerala school of astronomy and mathematics who followed him accepted his planetary model.[30][31] He also authored a treatise titled Jyotirmimamsa stressing the necessity and importance of astronomical observations to obtain correct parameters for computations.
Acyuta Pisārati 1550–1621 CE Sphutanirnaya (Determination of True Planets) details an elliptical correction to existing notions.[72] Sphutanirnaya was later expanded to Rāśigolasphutānīti (True Longitude Computation of the Sphere of the Zodiac).[32] Another work, Karanottama deals with eclipses, complementary relationship between the Sun and the Moon, and 'the derivation of the mean and true planets'.[32] In Uparāgakriyākrama (Method of Computing Eclipses), Acyuta Pisārati suggests improvements in methods of calculation of eclipses.[32]

Instruments used

Among the devices used for astronomy was gnomon, known as Sanku, in which the shadow of a vertical rod is applied on a horizontal plane in order to ascertain the cardinal directions, the latitude of the point of observation, and the time of observation.[33] This device finds mention in the works of Varāhamihira, Āryabhata, Bhāskara, Brahmagupta, among others.[34] The Cross-staff, known as Yasti-yantra, was used by the time of Bhaskara II (1114–1185 CE).[33] This device could vary from a simple stick to V-shaped staffs designed specifically for determining angles with the help of a calibrated scale.[33] The clepsydra (Ghatī-yantra) was used in India for astronomical purposes until recent times.[33] Ōhashi (2008) notes that: "Several astronomers also described water-driven instruments such as the model of fighting sheep."[33]

The armillary sphere was used for observation in India since early times, and finds mention in the works of Āryabhata (476 CE).[35] The Goladīpikā—a detailed treatise dealing with globes and the armillary sphere was composed between 1380–1460 CE by Parameśvara.[35] 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 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."[33]

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.[33] This device—called the Phalaka-yantra—was used to determine time from the sun's altitude.[33] The Kapālayantra was an equatorial sundial instrument used to determine the sun's azimuth.[33] Kartarī-yantra combined two semicircular board instruments to give rise to a 'scissors instrument'.[33] 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.[33]

Invented by Padmanābha, a nocturnal polar rotation instrument consisted of a rectangular board with a slit and a set of pointers with concentric graduated circles.[33] Time and other astronomical quantities could be calculated by adjusting the slit to the directions of α and β Ursa Minor.[33] 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 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."[33]

Ōhashi (2008) reports on the observatories constructed by Jai Singh II of Amber:

{{Quotation|1=The Mahārāja of Jaipur, Sawai Jai Singh (1688–1743 CE), constructed five astronomical observatories at the beginning of 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 the quadrants.[33]}}

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 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 the only examples of seamless metal globes. These Mughal metallurgists developed the method of lost-wax casting in order to produce these globes.[36]

Global discourse

Indian and Greek astronomy

The earliest known Indian astronomical work (though it is restricted to calendrical discussions) is the Vedanga Jyotisha of Lagadha, which is dated to 1400–1200 BCE (with the extant form possibly from 700–600 BCE).[5] According to Pingree, there are a number of Indian astronomical texts that are dated to the sixth century CE or later with a high degree of certainty. There is substantial similarity between these and pre-Ptolomaic Greek astronomy.[37] Pingree believes that these similarities suggest a Greek origin for certain aspects of Indian astronomy.

The Pingree – van der Waerden hypothesis in the history of astronomy holds that Indian texts from the 7th century reflect Greek astronomy of the first century. These texts represent information not available in Western libraries. Naturally the hypothesis is rejected by historians attributing originality to the Indian authors of these texts. First proposed by Bartel van der Waerden,[38] it has been thoroughly treated by David Pingree.[39]

With the rise of Greek culture in the east, Hellenistic astronomy filtered eastwards to India, where it profoundly influenced the local astronomical tradition.[6][7][8][9][103] For example, Hellenistic astronomy is known to have been practiced 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.[40]

Numerous interactions with 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.[41]

The Greek concept of a spherical earth surrounded by the spheres of planets, further influenced the astronomers like Varahamihira and Brahmagupta.[42][43]

Several Greco-Roman astrological treatises are also known to have been exported to India during the first few centuries of our era. The Yavanajataka was a Sanskrit text of the 3rd century CE on Greek horoscopy and mathematical astronomy.[6] 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."[44]

Later in 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. [45] Varāhamihira goes on to state that "The Greeks, indeed, are foreigners, but with them this science (astronomy) is in a flourishing state."[9] Another Indian text, the Gargi-Samhita, also similarly compliments the Yavanas (Greeks) noting that the Yavanas though barbarians must be respected as seers for their introduction of astronomy in India.[9]

Indian and Chinese astronomy

Indian astronomy reached China with the expansion of Buddhism during the Later Han (25–220 CE).[113] Further translation of Indian works on astronomy was completed in China by the Three Kingdoms era (220–265 CE).[46] 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.[46] 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 the Tang dynasty's national astronomical observatory.[46]

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.[47] Another Indian influence was an approximate formula used for timekeeping by Muslim astronomers.[48] Through Islamic astronomy, Indian astronomy had an influence on European astronomy via Arabic translations. During 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.[49]

Indian and Islamic astronomy

In 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 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 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.[50][51]

Indian astronomy and Europe

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.[122] Kerala was in continuous contact with China, Arabia and Europe. The existence of circumstantial evidence[52] 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.[53]

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 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.[54] 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 a number of observations were carried out".[55]

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 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. Hussain's idea of a universe resembles the modern concept of a galaxy, thus his view corresponds to the modern view that the universe consists of billions of galaxies, each one consisting of billions of stars.[56]

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 the heliocentric system into the Zij tradition.[57]

See also

{{Portal|India|Astrology|Astronomy}}{{col div|colwidth=25em}}
  • History of astronomy
  • Chinese astronomy
  • Islamic astronomy
  • Hindu calendar
  • Hindu cosmology
  • Hindu chronology
  • List of numbers in Hindu scriptures
  • Buddhist cosmology
  • Jain cosmology
{{colend}}

Further reading

  • Project of History of Indian Science, Philosophy and Culture, Monograph series, Volume 3. Mathematics, Astronomy and Biology in Indian Tradition edited by D. P. Chattopadhyaya and Ravinder Kumar
  • {{Citation|last=Brennand|first=William |title=Hindu Astronomy|url=https://archive.org/stream/hinduastronomy00brenuoft#page/n7/mode/2up|year=1896|publisher=Chas.Straker & Sons, London}}
  • {{Citation|last=Maunder|first=E. Walter |title=The Indian Eclipse 1898|url=https://archive.org/stream/indianeclipserep00britrich#page/n7/mode/2up|year=1899|publisher=Hazell Watson and Viney Ltd., London}}
  • Kak, Subhash. Birth and early development of Indian astronomy. Kluwer, 2000.
  • Kak, S. (2000). The astronomical code of the R̥gveda. New Delhi: Munshiram Manoharlal Publishers.
  • Kak, Subhash C. "The astronomy of the age of geometric altars." Quarterly Journal of the Royal Astronomical Society 36 (1995): 385.
  • Kak, Subhash C. "Knowledge of planets in the third millennium BC." Quarterly Journal of the Royal Astronomical Society 37 (1996): 709.
  • Kak, S. C. (January 01, 1993). Astronomy of the vedic altars. Vistas in Astronomy: Part 1, 36, 117-140.
  • Kak, Subhash C. "Archaeoastronomy and literature." Current Science 73.7 (1997): 624-627.

Notes

1. ^1 {{cite book|title=A Question and Answer Guide to Astronomy|page=197|author1=Pierre-Yves Bely |author2=Carol Christian |author3=Jean-René Roy |url=https://books.google.com/?id=PbLPel3zRdEC&pg=PA197&dq=%22Indian+astronomy%22#v=onepage&q=%22Indian%20astronomy%22&f=false|publisher=Cambridge University Press|isbn=9780521180665|date=2010-03-11}}
2. ^1 {{cite journal|title= Astronomy in the Indus Valley Civilization A Survey of the Problems and Possibilities of the Ancient Indian Astronomy and Cosmology in the Light of Indus Script Decipherment by the Finnish Scholars | doi=10.1111/j.1600-0498.1977.tb00351.x | volume=21|issue = 2|journal=Centaurus|pages=149–193|bibcode=1977Cent...21..149A|year = 1977|last1 = Ashfaque|first1 = Syed Mohammad}}
3. ^1 2 3 4 5 6 Sarma (2008), Astronomy in India
4. ^The Vedas: An Introduction to Hinduism’s Sacred Texts, Roshen Dalal, p.188
5. ^1 {{cite book|last=Subbarayappa|first=B. V.|editor=Biswas, S. K. |editor2=Mallik, D. C. V. |editor3=Vishveshwara, C. V. |title=Cosmic Perspectives|chapter-url=https://books.google.com/books?id=PFTGKi8fjvoC&pg=FA25|date=14 September 1989|publisher=Cambridge University Press|isbn=978-0-521-34354-1|pages=25–40|chapter=Indian astronomy: An historical perspective}}
6. ^1 2 3 4 5 Highlights of Astronomy, Volume 11B: As presented at the XXIIIrd General Assembly of the IAU, 1997. Johannes Andersen Springer, 31 January 1999 – Science – 616 pages. page 721 [https://books.google.com/books?id=gQYscrT0fgQC&pg=PA721&dq=yavanajataka&hl=en&sa=X&ei=7l0YUfGMNuibygHmiIDgCg&ved=0CDQQ6AEwAQ#v=onepage&q=yavanajataka&f=false]
7. ^1 2 Babylon to Voyager and Beyond: A History of Planetary Astronomy. David Leverington. Cambridge University Press, 29 May 2010 – Science – 568 pages. page 41 [https://books.google.com/books?id=6Hpi202ybn8C&pg=PA41&dq=greek+astronomy+india&hl=en&sa=X&ei=zlsYUcn9MtHbqwGFvoCoBw&ved=0CDAQ6AEwAA#v=onepage&q=greek%20astronomy%20india&f=false]
8. ^1 2 The History and Practice of Ancient Astronomy. James Evans. Oxford University Press, 1 October 1998 – History – 496 pages. Page 393 [https://books.google.com/books?id=LVp_gkwyvC8C&pg=PA393&dq=greek+astronomy+india&hl=en&sa=X&ei=zlsYUcn9MtHbqwGFvoCoBw&ved=0CDwQ6AEwAg#v=onepage&q=greek%20astronomy%20india&f=false]
9. ^1 2 3 4 Foreign Impact on Indian Life and Culture (c. 326 B.C. to C. 300 A.D.). Satyendra Nath Naskar. Abhinav Publications, 1 January 1996 – History – 253 pages. Pages 56–57 [https://books.google.com/books?id=SuEBGgRHHuIC&pg=PA57&dq=greek+astronomy+india&hl=en&sa=X&ei=zlsYUcn9MtHbqwGFvoCoBw&ved=0CFQQ6AEwBg#v=onepage&q=greek%20astronomy%20india&f=false]
10. ^"Star Maps: History, Artistry, and Cartography", p. 17, by Nick Kanas, 2012
11. ^{{cite book|title=Kalaprakasika|author= N. P. Subramania Iyer|publisher=Asian Educational Services|page=3}}
12. ^Ōhashi (1993)
13. ^{{cite book|title=Science, Technology, Imperialism, and War|page=33|author=Jyoti Bhusan Das Gupta|publisher=Pearson Education India}}
14. ^Foreign Impact on Indian Life and Culture (c. 326 B.C. to C. 300 A.D.). Satyendra Nath Naskar. Abhinav Publications, 1 January 1996 – History – 253 pages. Pages 56–57 [https://books.google.com/books?id=SuEBGgRHHuIC&pg=PA57&dq=greek+astronomy+india&hl=en&sa=X&ei=zlsYUcn9MtHbqwGFvoCoBw&ved=0CFQQ6AEwBg#v=onepage&q=greek%20astronomy%20india&f=false]
15. ^1 2 3 4 Hayashi (2008), Aryabhata I
16. ^1 2 J.A.B. van Buitenen (2008)
17. ^Bryant (2001), 253
18. ^See A. Cunningham (1883), A Book of Indian Eras.
19. ^1 Subbaarayappa (1989)
20. ^1 2 Tripathi (2008)
21. ^Indian Astronomy. (2013). In D. Leverington, Encyclopedia of the history of Astronomy and Astrophysics. Cambridge, United Kingdom: Cambridge University Press. Retrieved from http://search.credoreference.com/content/entry/cupaaa/indian_astronomy/0
22. ^1 Hayashi (2008), Brahmagupta
23. ^Brahmagupta, Brahmasphutasiddhanta (628) (cf. al-Biruni (1030), Indica)
24. ^1 Varāhamihira. Encyclopædia Britannica (2008)
25. ^1 Hayashi (2008), Bhaskara I
26. ^1 2 3 4 5 6 Sarma (2008), Lalla
27. ^Hayashi (2008), Bhaskara II
28. ^Hayashi (2008), Shripati
29. ^1 2 3 4 5 Ōhashi (1997)
30. ^1 Joseph, 408
31. ^Ramasubramanian etc. (1994)
32. ^1 2 3 Sarma (2008), Acyuta Pisarati
33. ^1 2 3 4 5 6 7 8 9 10 11 12 13 14 Ōhashi (2008), Astronomical Instruments in India
34. ^1 2 Abraham (2008)
35. ^1 Sarma (2008), Armillary Spheres in India
36. ^Savage-Smith (1985)
37. ^{{cite journal | first=David | last=Pingree | title=The Recovery of early Greek Astronomy from India | publisher=Science History Publications Ltd. | journal= Journal for the History of Astronomy | volume=7 | issue = 19 | date=1976 | pages=109–123 | bibcode=1976JHA.....7..109P| doi=10.1177/002182867600700202 }}
38. ^{{cite journal | first = B. L. | last=Van Der Waerden | title=Two Treatises on Indian Astronomy|publisher=Science History Publications Ltd. | journal=Journal for the History of Astronomy | volume=11 | issue = 30 | date=1980 | pages=50–62 | bibcode=1980JHA....11...50V| doi=10.1177/002182868001100105 }}
39. ^Dennis Duke [https://people.sc.fsu.edu/~dduke/Thursday_slides Indian Planetary Theories and Greek Astronomy] from Florida State University
40. ^Pierre Cambon, Jean-François Jarrige. "Afghanistan, les trésors retrouvés: Collections du Musée national de Kaboul". Éditions de la Réunion des musées nationaux, 2006 – 297 pages. p269 [https://books.google.com/books?id=xJFtQgAACAAJ&dq=afghanistan,+les+tresors+retrouves&hl=en&ei=t7ssTsL0EI2usAOSg8TMCg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCwQ6AEwAA]
41. ^Pierre Cambon, Jean-François Jarrige. "Afghanistan, les trésors retrouvés: Collections du Musée national de Kaboul". Éditions de la Réunion des musées nationaux, 2006 – 297 pages. p269 [https://books.google.com/books?id=xJFtQgAACAAJ&dq=afghanistan,+les+tresors+retrouves&hl=en&ei=t7ssTsL0EI2usAOSg8TMCg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCwQ6AEwAA] "Les influences de l'astronomie grecques sur l'astronomie indienne auraient pu commencer de se manifester plus tot qu'on ne le pensait, des l'epoque Hellenistique en fait, par l'intermediaire des colonies grecques des Greco-Bactriens et Indo-Grecs" (French) Afghanistan, les trésors retrouvés", p269. Translation: "The influence of Greek astronomy on Indian astronomy may have taken place earlier than thought, as soon as the Hellenistic period, through the agency of the Greek colonies of the Greco-Bactrians and the Indo-Greeks.
42. ^1 D. Pingree: "History of Mathematical Astronomy in India", Dictionary of Scientific Biography, Vol. 15 (1978), pp. 533–633 (533, 554f.)
43. ^{{cite book| last1=Williams| first1=Clemency| last2=Knudsen| first2=Toke| editor=Glick, Tomas F. |editor2=Livesey, Steven John |editor3=Wallis, Faith |title=Medieval Science, Technology, and Medicine: An Encyclopedia |chapter-url=https://books.google.com/books?id=SaJlbWK_-FcC&pg=FA463 |date=2005 |publisher=Routledge |isbn=978-0-415-96930-7 |pages=463 |chapter=South-Central Asian Science}}
44. ^Pingree, David "Astronomy and Astrology in India and Iran" Isis, Vol. 54, No. 2 (Jun. 1963), pp. 229–246
45. ^{{cite encyclopedia|quote = Varāhamihira's knowledge of Western astronomy was thorough. In five sections, his monumental work progresses through native Indian astronomy and culminates in two treatises on Western astronomy, showing calculations based on Greek and Alexandrian reckoning and even giving complete Ptolemaic mathematical charts and tables.|encyclopedia = Encyclopædia Britannica |url = https://www.britannica.com/biography/Varahamihira|title = Varahamihira}}
46. ^1 2 3 See Ōhashi (2008) in Astronomy: Indian Astronomy in China.
47. ^Dallal, 162
48. ^King, 240
49. ^Joseph, 306
50. ^Sharma (1995), 8–9
51. ^Baber, 82–89
52. ^Raju (2001)
53. ^1 Almeida etc. (2001)
54. ^Baber, 89–90
55. ^{{cite book|title=History of oriental astronomy: proceedings of the joint discussion-17 at the 23rd General Assembly of the International Astronomical Union, organised by the Commission 41 (History of Astronomy), held in Kyoto, August 25–26, 1997|author=S. M. Razaullah Ansari|publisher=Springer|isbn=978-1-4020-0657-9|page=141|year=2002}}
56. ^{{citation|title=History of oriental astronomy: proceedings of the joint discussion-17 at the 23rd General Assembly of the International Astronomical Union, organised by the Commission 41 (History of Astronomy), held in Kyoto, August 25–26, 1997|author=S. M. Razaullah Ansari|publisher=Springer|year=2002|isbn=978-1-4020-0657-9|pages=133–4}}
57. ^{{citation|title=History of oriental astronomy: proceedings of the joint discussion-17 at the 23rd General Assembly of the International Astronomical Union, organised by the Commission 41 (History of Astronomy), held in Kyoto, August 25–26, 1997|author=S. M. Razaullah Ansari|publisher=Springer|year=2002|isbn=978-1-4020-0657-9|page=138}}

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{{col-end}}{{Indian astronomy|state=uncollapsed}}{{India topics}}{{Astronomy navbox}}{{Indianscience}}{{Hindu calendar}}{{DEFAULTSORT:Indian Astronomy}}

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