Lunar calendar is one of the traditional calendars in China, also known as lunar calendar, lunar calendar, ancient calendar, Han calendar, yellow calendar, summer calendar and old calendar.
Astronomy mainly refers to the calendar arranged according to the moon phase cycle, in which the moon orbits the earth once (taking the sun as the reference, the actual moon runs for more than one week). ) is January, that is, the calendar based on the moon, with twelve calendar months in a year. In the process of calendar development and evolution, the emergence of 24 solar terms was used to scientifically guide agricultural production, and the lunar calendar (Han calendar) was formed.