Jōkyō calendar
Jōkyō calendar (貞享暦, Jōkyō-reki), also called Teikyō-reki, was a Japanese lunisolar calendar (genka reki).[1] It was used from 1684-1753.[2] It was made official in 1685.[3]
History
[change | change source]The Jōkyō-reki system was the work of Shibukawa Shunkai.[4] He recognized that the length of the solar year is 365.2417 days.[2]
Shirakawa discovered errors in the traditional Chinese calendar which had been in use for 800 years.[4] This older system was also known as the Semmyō calendar or 'Semmei-reki. It was also known as the Xuanming calendar.[5]
Related pages
[change | change source]References
[change | change source]- ↑ Nussbaum, Louis-Frédéric. (2005). "Calendar" in Japan Encyclopedia, p. 98.
- ↑ 2.0 2.1 Nussbaum, "Jōkyō-reki" at p. 431; "Teikyō-reki" at p. 956
- ↑ Orchiston, Wayne et al. (2011). Highlighting the History of Astronomy in the Asia-Pacific Region, p. 155; Bramsen, William. (1880). Japanese chronological tables, p. 25.
- ↑ 4.0 4.1 Nussbaum, "Shibukawa Shunkai" at pp. 850-851.
- ↑ Nussbaum, "Semmei-reki" at p. 840.
Other websites
[change | change source]