Gautama Siddha, (fl. 8th century)

astronomer An astronomer is a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth. They observe astronomical objects such as stars, planets, moons, comets and galaxies – in either ...

, astrologer and compiler of

Indian Indian or Indians may refer to: Peoples South Asia * Indian people, people of Indian nationality, or people who have an Indian ancestor ** Non-resident Indian, a citizen of India who has temporarily emigrated to another country * South Asia ...

descent, known for leading the compilation of the ''

Treatise on Astrology of the Kaiyuan Era The ''Great Tang Treatise on Astrology of the Kaiyuan Era'', also called the ''Kaiyuan Star Observations''Deng, Yinke. 005(2005). Chinese Ancient Inventions. (''Kaiyuan Zhanjing''),Needham, Volume 3, 109. is a Chinese astrology encyclopedia ...

'' during the

Tang Dynasty The Tang dynasty (, ; zh, t= ), or Tang Empire, was an imperial dynasty of China that ruled from 618 to 907 AD, with an interregnum between 690 and 705. It was preceded by the Sui dynasty and followed by the Five Dynasties and Ten Kingdom ...

. He was born in

Chang'an Chang'an (; ) is the traditional name of Xi'an. The site had been settled since Neolithic times, during which the Yangshao culture was established in Banpo, in the city's suburbs. Furthermore, in the northern vicinity of modern Xi'an, Qin S ...

, and his family was originally from

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...

, according to a tomb stele uncovered in 1977 in

Xi'an Xi'an ( , ; ; Chinese: ), frequently spelled as Xian and also known by other names, is the capital of Shaanxi Province. A sub-provincial city on the Guanzhong Plain, the city is the third most populous city in Western China, after Chongqi ...

. The Gautama family had probably settled in China over many generations, and might have been present in China prior even to the foundation of the Tang Dynasty. He was most notable for his translation of

Navagraha Navagraha are nine heavenly bodies and deities that influence human life on Earth according to Hinduism and Hindu astrology. The term is derived from ''nava'' ( sa, नव "nine") and ''graha'' ( sa, ग्रह "planet, seizing, laying hold of, ...

calendar into

Chinese Chinese can refer to: * Something related to China * Chinese people, people of Chinese nationality, citizenship, and/or ethnicity **''Zhonghua minzu'', the supra-ethnic concept of the Chinese nation ** List of ethnic groups in China, people of ...

. He also introduced

Indian numerals Indian or Indians may refer to: Peoples South Asia * Indian people, people of Indian nationality, or people who have an Indian ancestor ** Non-resident Indian, a citizen of India who has temporarily emigrated to another country * South Asia ...

with zero (〇) in 718 in China as a replacement of

counting rods Counting rods () are small bars, typically 3–14 cm long, that were used by mathematicians for calculation in ancient East Asia. They are placed either horizontally or vertically to represent any integer or rational number. The written ...

References

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Footnotes

8th-century births 8th-century deaths Chinese astrologers Chinese people of Indian descent 8th-century Chinese astronomers Indian astrologers Writers from Xi'an Tang dynasty writers Scientists from Shaanxi 8th-century astrologers Medieval Indian astrologers 8th-century Indian astronomers 8th-century Indian writers 8th-century Chinese translators {{astronomer-stub