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Overview
Key data
| Item | Detail |
|---|---|
| Period of use | 785 – 821 CE |
| Compilers | Xu Chengsi, Yang Jingfeng |
| Year head | Jian-yin |
Development
The Zhengyuan calendar was made by Xu Chengsi and Yang Jingfeng, promulgated in 785 CE and used until 821.
It too worked within the old methods, taking the Dayan as its basis and adjusting it against observation.
The office of the calendrist
The Tang kept an Astronomical Bureau (Taishiju, later Sitian Tai) for the calendar, staffed by specialists. A calendar had to be measured, debated and promulgated — the work of many, not one.
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 29.
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.