宣明历 Tang · Xu Ang

Overview

Promulgated in 822 CE under Xu Ang. The longest-used calendar of the Tang; it also reached Japan, where it was adopted.

Key data

Item	Detail
Period of use	822 – 892 CE
Compiler	Xu Ang
Year head	Jian-yin

Xu Ang and the Xuanming calendar

The Xuanming calendar was made by Xu Ang, promulgated in 822 CE and used until 892 — seventy years, the longest use of any Tang calendar.

Xu also refined the computation of eclipses and the equation of time.

To Japan

The Xuanming calendar reached Japan, where it was adopted in 861; as the “Senmyō-reki” it remained in use into the early Edo period, some eight hundred years.

A Tang calendar used in a neighboring land for more than eight centuries is a landmark in Sino-Japanese exchange and a measure of the reach of Tang calendrical work.

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 30a.
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.

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