Jōkyō calendar
The Jōkyō calendar (貞享暦, Jōkyō-reki) was a Japanese lunisolar calendar, in use from 1684 to 1753.[1] It was officially adopted in 1685.[2]
History
The Jōkyō-reki system was developed and explained by Shibukawa Shunkai.[3] He recognized that the length of the solar year is 365.2417 days.[1]
Shibukawa discovered errors in the traditional Chinese calendar, the Senmyō calendar, which had been in use for 800 years.[3]
See also
References
- ^ a b Nussbaum, "Jōkyō-reki" at p. 431; "Teikyō-reki" at p. 431
- ^ Orchiston, Wayne et al. (2011). Highlighting the History of Astronomy in the Asia-Pacific Region, p. 155.
- ^ a b Nussbaum, "Shibukawa Shunkai" at pp. 850–851.
External links
- National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection