What is the lunar calendar based on (is the moon revolving or rotating? )

The lunar calendar is a calendar arranged according to the moon phase cycle, and the moon revolves around the earth in January.

That is, the first month of the lunar calendar is used as the basis for determining the calendar month, and the calendar of 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. 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.

The lunar calendar determines the moon according to the law of its movement: the orbit of the moon is called the white road, and both the white road and the ecliptic are two great circles on the celestial body, which intersect at five degrees and nine minutes. The moon goes around the earth and appears on the ecliptic twice, which lasts for 7 hours and 43 minutes 1 1.5 seconds on the 27th, and is called "Stellar Moon".

Extended data:

Rotation period

The moon revolves around the earth and rotates at the same time, with a period of 27.438+066 days, which happens to be a sidereal moon, so we can't see the back of the moon. We call this phenomenon "synchronous rotation", which is almost a universal law in the satellite world. It is generally believed that it is the result of the long-term tidal action of planets on satellites. The libration is a wonderful phenomenon, which enables us to see 59% of the moon. There are mainly the following reasons:

1. In different parts of the elliptical orbit, the rotation speed does not match the revolution angular speed.

2, the intersection of the white road and the equator.

Baidu Encyclopedia-Moon Rotation

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