Jōkyō calendar
{{short description|Japanese lunisolar calendar}}
File:Jokyo-reki.jpg, Tokyo, Japan.]]
The {{nihongo|Jōkyō calendar|貞享暦|Jōkyō-reki}} was a Japanese lunisolar calendar, in use from 1684 to 1753.Nussbaum, [https://books.google.com/books?id=p2QnPijAEmEC&pg=PA431&dq= "Jōkyō-reki"] at p. 431; [https://books.google.com/books?id=p2QnPijAEmEC&pg=PA9561&dq= "Teikyō-reki"] at p. 431 It was officially adopted in 1685.Orchiston, Wayne et al. (2011). [https://books.google.com/books?id=vOUWfhBheDIC&pg=PA155&dq= Highlighting the History of Astronomy in the Asia-Pacific Region, p. 155].
History
The Jōkyō-reki system was developed and explained by Shibukawa Shunkai.Nussbaum, [https://books.google.com/books?id=p2QnPijAEmEC&pg=PA850&dq= "Shibukawa Shunkai"] at pp. 850–851. He recognized that the length of the solar year is 365.2417 days.
Shibukawa discovered errors in the traditional Chinese calendar, the Senmyō calendar, which had been in use for 800 years.
See also
References
{{reflist}}
External links
- National Diet Library, "The Japanese Calendar" [http://www.ndl.go.jp/koyomi/e/ -- historical overview plus illustrative images from library's collection]
{{Japanese calendars}}
{{DEFAULTSORT:Jokyo calendar}}
Category:History of science and technology in Japan