Japanese lunisolar calendar From Wikipedia, the free encyclopedia
Jōkyō calendar (貞享暦, Jōkyō-reki), also called Teikyō-reki, was a Japanese lunisolar calendar (genka reki).[1] It was used from 1684-1753.[2] It was made official in 1685.[3]
The Jōkyō-reki system was the work of Shibukawa Shunkai.[4] He recognized that the length of the solar year is 365.2417 days.[2]
Shirakawa discovered errors in the traditional Chinese calendar which had been in use for 800 years.[4] This older system was also known as the Semmyō calendar or 'Semmei-reki. It was also known as the Xuanming calendar.[5]
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