Jōkyō calendar

, also called Teikyō-reki, was a Japanese lunisolar calendar (genka reki).Nussbaum, Louis-Frédéric. (2005). "Calendar" in Japan Encyclopedia, p. 98.  It was used from 1684-1753.Nussbaum, "Jōkyō-reki" at p. 431; "Teikyō-reki" at p. 956  It was made official in 1685.Orchiston, Wayne et al. (2011). Highlighting the History of Astronomy in the Asia-Pacific Region, p. 155; Bramsen, William. (1880). Japanese chronological tables, p. 25.

History
The  Jōkyō-reki system was the work of Shibukawa Shunkai.Nussbaum, "Shibukawa Shunkai" at pp. 850-851. He recognized that the length of the solar year is 365.2417 days.

Shirakawa discovered errors in the traditional Chinese calendar which had been in use for 800 years.   This older system was also known as the Semmyō calendar or 'Semmei-reki.  It was also known as the Xuanming'' calendar.Nussbaum, "Semmei-reki" at p. 840.

Related pages
 Japanese calendar
 Sexagenary cycle
 Jōkyō
 Hōryaku calendar
 Kansei calendar
 Tenpō calendar

References


Other websites
 National Diet Library, "The Japanese Calendar"

Category:Calendars