The lunar calendar is the lunar calendar.

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.

In astronomy, it mainly refers to the calendar arranged according to the moon phase cycle, in which the moon orbits the earth once (based on the sun, the actual moon orbits more than once). ) is January, which is a calendar based on the moon. There are twelve calendar months in a year.

In the process of calendar development and evolution, the emergence of 24 solar terms was used to guide agricultural production scientifically, and the lunar calendar (Han calendar) was formed. Although the lunar calendar and lunar calendar are commonly known as ancient calendar, Han calendar, summer calendar and old calendar, there are still differences between lunar calendar and lunar calendar (Han calendar). The traditional summer calendar (Han calendar) is actually a kind of yin-yang calendar.

Extended data

The lunar calendar takes the change cycle of the moon phase, that is, the length of the moon as the month, plus the "24 solar terms" component of the dry calendar, and takes the length of the tropical year of the sun as the year. By setting leap months, the average calendar year will adapt to the tropic year. Therefore, the lunar calendar has both lunar and solar elements. Unlike the Gregorian calendar, which is fixed at 365 days or 366 days, the Gregorian calendar sometimes differs from the Gregorian calendar by one month.

In order to coordinate the number of days between the return year and the first lunar month, the lunar calendar came into being. The method is to add 24 solar terms and "19 7 leap year" to the calendar (that is, add 7 leap years to the 19 lunar year).

There is an extra leap month in the leap year of the lunar calendar, so there are an average of 383.8978 days in a year, compared with an average of 354.3672 days in the normal year of the lunar calendar. ) make the average number of days in a year consistent with the number of days in the Tropic of Cancer.