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]
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]
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]
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]