Jōkyō calendar explained

The 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

External links

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

Notes and References

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