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Overview
Key data
| Item | Detail |
|---|---|
| Period | Tang (brought in under Kaiyuan) |
| Translator | Gautama Siddha |
| Origin | Indian astronomy |
Origin and translation
The Jiuzhi calendar came from India and was translated in the Kaiyuan era by Gautama Siddha, director of the astronomical bureau, for his Kaiyuan Zhanjing. “Nine holders” refers to the nine luminaries of Indian astronomy.
It brought a set of Indian methods — geometric treatment of the positions of sun and moon, and the “asura-cloud” and other concepts for eclipses — in many ways unlike the Chinese tradition.
Significance
Its arrival let Tang calendrists meet a foreign system of reckoning, a clear case of exchange in the history of science.
Because the Kaiyuan Zhanjing includes it, that work is essential for the study of Tang astronomical exchange.
Full text
No electronic full text of this work is available here. This calendar has no separate transmitted text; its methods survive scattered in the calendrical treatises of the standard histories. Among the histories held here, see New Tang History, Calendrical Treatise, juan 28b.
The title, date, summary and index structure compiled here are offered under CC BY 4.0 (attribution: Chujia Kuang · kuangchujia.com).
Compiled and arranged by Chujia Kuang.