Books converted from lunar calendar to solar calendar in Song Dynasty

According to the query of Douban reading, the book about the conversion from the lunar calendar to the Gregorian calendar in the Song Dynasty is 365 days in the Song Dynasty: Song Yunli.

The lunar calendar, that is, the current traditional calendar in China, belongs to the yin-yang calendar, that is, the lunar calendar and the solar calendar. According to the change cycle of the moon phases, each moon phase changes to one month, taking the tropical year of the sun as the length of a year, and adding 24 solar terms and setting leap months to make the average calendar year adapt to the tropical year.