What is the astrological calendar?

The difference between the twenty-four solar terms: the ancient "astrological calendar" is also based on the movement of the sun in celestial bodies. So China used to use the lunar calendar; Actually, it's a combination of yin and yang. In addition to the benchmark of one year 12 months and January 30 days, according to the movement of the sun on celestial bodies and the change and influence of the ground weather, 12 months are ruled by four seasons. It is also equal to the four virtues of "Yuan, Heng, Reason and Truth" in the Book of Changes. In addition to the twelve months of the four seasons, it is further divided into 24 solar terms, such as "Winter Solstice Day, Slight Cold (December Festival), Great Cold, Rain in beginning of spring (January Festival), Spring Equinox (February Festival), Tomb-Sweeping Day (March Festival), Xiaoman in Grain Rain, Long Summer (April Festival) and Miscanthus (May Festival). The standard of these 24 solar terms is based on the relationship between the sun and the earth's meteorology, not on the profit and loss of the lunar calendar (month).