What is the origin of the lunar calendar?

The lunar calendar is based on the lunar calendar (summer calendar), combining the elements of the solar calendar and absorbing the 24 solar terms of the solar calendar as a supplement.

The traditional calendars in China are also called lunar calendar, lunar calendar, summer calendar, lunar calendar and lunar calendar. The lunar calendar is not a simple lunar calendar, but a combination of yin and yang. Take the change period of the moon phase as the length of the month, add the "24 solar terms" component of the trunk calendar, and refer to the length of the tropical year of the sun as the year. By setting leap months, the average calendar year can adapt to the tropic year.

The lunar calendar is a calendar based on the lunar calendar (summer calendar) and integrating the solar calendar. Therefore, strictly speaking, the lunar calendar in China should not be called the lunar calendar, but the combined calendar of yin and yang. Its years are divided into normal years and leap years. An average year is twelve months; A leap year is thirteen months.

Extended data:

The lunar calendar does not consider the movement of the earth around the sun, so the changes of the four seasons have no fixed time in the lunar calendar and cannot reflect the seasons. Unlike the fixed solar year of 365 days or 366 days, the solar year sometimes differs from the lunar year by one month. In order to coordinate the number of days between lunar year and solar year, the "leap method" is used to adjust the total number of days in lunar period to the total number of days in tropic year of solar calendar.

Old calendar, old calendar and lunar calendar also refer to the lunar calendar. However, the old calendar and the old calendar are only relative to the new calendar (that is, the Gregorian calendar), and they are not proper titles. The lunar calendar is actually a calendar arranged only according to the changes of the moon phases.

References:

Baidu Encyclopedia _ Lunar Calendar