Jōkyō calendar
Japanese lunisolar 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
- Japanese calendar
- Sexagenary cycle
- Jōkyō
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
- v
- t
- e
Japanese calendar
- Genka calendar 692–696
- Gihō calendar 697–763
- Taien calendar 764–862
- Goki calendar 858–861
- Semmyō calendar 862–1685
- Jōkyō calendar 1685–1755
- Hōryaku calendar 1755–1798
- Kansei calendar 1798–1844
- Tenpō calendar 1844–1872
- Gregorian calendar 1873–present