The Yingtian Calendar is an official calendar compiled by Wang Chune, Vice Director of the Directorate of Astr…
The Yingtian Calendar is an official calendar compiled by Wang Chune, Vice Director of the Directorate of Astronomy, and others under imperial decree in the second year of Jianlong. It introduced the seven-day week system and the epoch-measuring method. The work consists of six volumes; the original is now lost.