How did the twenty-four solar terms come into being?

The formation of the 24 solar terms is determined by the bucket handle direction of the Big Dipper, and bucket handle rotates around the east, south, west and north, which is called one of the "years"; Every rotation cycle starts from beginning of spring and ends with the Great Cold. The current "twenty-four solar terms" are divided by "constant gas method", that is, each solar term corresponds to a certain position that the earth reaches every time it runs 15 on the ecliptic; The method of "fixing qi" divides the sun's annual movement track into 24 equal parts, each equal part is 15, and each equal part is a solar term, which starts from beginning of spring and ends with severe cold. "Twenty-four solar terms" express the unique concept of time between human beings and the natural universe, and contain the long-standing cultural connotation and historical accumulation of the Chinese nation.

Twenty-four solar terms meaning:

"Twenty-four solar terms" reflect the influence of the sun on the earth and belong to the solar calendar category. It is a knowledge system formed by observing the movement of the sun in a year and understanding the changing laws of the four seasons, climate and phenology in a year. It not only plays a guiding role in agricultural production, but also affects the food, clothing, housing and transportation of ancient people, and even cultural concepts.

The twenty-four solar terms reflect the annual apparent motion of the sun, so their dates are relatively fixed in the Gregorian calendar. The solar term in the first half of the year is on the 6th, the solar term in the second half is on the 8th and the solar term is on the 23rd, with a difference of 1 ~ 2 days.

24 solar terms:

Beginning of spring, Jingzhe, Qingming, Changxia, Mangzhong, Xiaoshu, beginning of autumn, Bailu, Hanlu, beginning of winter, Snow, Slight Cold, Rain, Vernal Equinox, Grain Rain, Xiaoman, Summer Solstice, Dashu, Early Summer, Autumn Equinox, Early Frost, Light Snow, Winter Solstice and Great Cold.