Hōryaku calendar

The Hōryaku calendar was a Japanese lunisolar calendar. It was also known as Hōryaku Kōjutsu Gen-reki. It was published in 1755.

History

The Hōryaku Kōjutsu Genreki system was the work of Abe Yasukuni, Shibukawa Kōkyō, and Nishiyama Seikyū. Errors in the calendar were corrected in 1798 and in 1844. In 1872, the Western calendar was adopted.