How did the ancient calendar in China "combine Yin and Yang"? What's the difference between Gregorian calendar and Gregorian calendar?

The solar calendar, also known as the solar calendar, is more determined by the change of the solar cycle and reflects the changes of the four seasons. The 24 solar terms come from this, mainly reflecting the climate of the North China Plain south of the Yangtze River in China, and are not applicable to the south, northeast and northwest of the Yangtze River in China.

The lunar calendar, also known as the lunar calendar, comes from the change of the phases of the moon, because in China, Yin and Yang are emphasized, and the circle and the change of the moon show the mutual change of Yin and Yang. The circle and the circle of the moon also affect some people's physiological changes, such as women's reproductive cycle, so it is usually veiled with metaphysics as a basis for discussing gains and losses.

The ancient calendar in China should be based on the lunar calendar, supplemented by the solar calendar, with 30 days in January, 65438+ February in February, and about 29 days in January (there is no 30 in December of the Year of the Rooster, and there is no beginning of spring, which is not conducive to marriage).