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]

Jōkyō calendar published in 1729. Exhibit in the National Museum of Nature and Science, Tokyo, Japan.

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

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.
Nussbaum, "Shibukawa Shunkai" at pp. 850–851.

External links

National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection

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

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