Excuse me: How many days are there in a solar term?

The ancients in China divided the sun's annual trajectory into 24 equal parts, each of which was divided into a solar term, and each solar term had three cycles, each of which was five days. According to the law of the operation of heaven and earth, the ancients determined the starting point and ending point of the four-season cycle and divided the 24 solar terms. The trajectory of the sun in a year is divided into 24 equal parts, each of which is a "solar term", collectively called "twenty-four solar terms".

Because it takes 365 days for the earth to go around the sun, there is a solar term every fifteen days, and each solar term represents different changes in climate, phenology and time.

Extended data:

Source of solar terms

"Twenty-four solar terms" is a knowledge system and social practice formed by China people by observing the movement of the sun for a year and understanding the changing laws of the four seasons, climate and phenology in a year.

"Twenty-four solar terms" were formed in the Yellow River Basin. Based on the observation of the time series changes of astronomical phenomena, temperature, precipitation and phenology in this area, as a time guide for the production and life of agricultural society, it has been gradually adopted throughout the country and enjoyed by many ethnic groups.

Baidu encyclopedia-solar terms

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