How to determine the 24 solar terms?

65438+10-June is the first half year, and July-65438+February is the second half year. In the first half of the year, 2 1 is a solar term every 6 days, and in the second half of the year, it is a solar term every 8 days and 23 days, with a general difference of one or two days.

Twenty-four solar terms table is a supplementary calendar made by China to guide farming in ancient times, and it is the crystallization of long-term experience and wisdom of working people in ancient China. It was formed in the Spring and Autumn Period and the Warring States Period. Because the lunar calendar in China is a kind of "yin and yang calendar", which is based on the movement of the sun and the moon and cannot fully reflect the solar cycle. But China is an agricultural society, and agriculture needs a strict understanding of the movement of the sun, so farming is entirely based on the sun. Therefore, the "twenty-four solar terms" that reflect the solar cycle alone are added to the calendar as the standard for determining leap months.

Twenty-four solar terms can reflect the changes of seasons, guide agricultural activities and affect the food, clothing, housing and transportation of thousands of families. The twenty-four solar terms are divided according to the position of the sun on the ecliptic (that is, the orbit of the earth around the sun).