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Jōkyō calendar

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

The Jōkyō calendar (貞享暦, Jōkyō-reki) was a Japanese lunisolar calendar. It was used from 1684-1753.[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]

Shirakawa discovered errors in the traditional Chinese calendar, the Semmyō calendar, which had been in use for 800 years.[3]

See also

References

  1. ^ a b Nussbaum, "Jōkyō-reki" at p. 431; "Teikyō-reki" at p. 431
  2. ^ Orchiston, Wayne et al. (2011). Highlighting the History of Astronomy in the Asia-Pacific Region, p. 155.
  3. ^ a b Nussbaum, "Shibukawa Shunkai" at pp. 850-851.
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