The corresponding timetable of the twenty-four solar terms
The twenty-four solar terms are roughly divided into twenty-four stages according to the earth's revolution around the sun, that is, a tropical year. Actually depends on the sun's exposure to the earth. The actual solar terms are slightly different from the date and time here, usually one or two days at most, and the actual use shall prevail.
The origin of the twenty-four solar terms
As early as the Spring and Autumn Period and the Warring States Period, the Chinese people had the concept of Solstice in the South and Solstice in the North. Subsequently, people divided the year into 24 equal parts according to the natural phenomena such as the beginning of the month, the running position in the middle of the month, the weather, the growth of animals and plants, and gave each equal part a proper term, that is, the 24 solar terms.
By the end of the Warring States Period, solar terms had eight names: beginning of spring, Equinox, Long Summer, Summer Solstice, beginning of autumn, Equinox, beginning of winter and Winter Solstice. These eight solar terms are the most important of the 24 solar terms, indicating the change of seasons and clearly dividing the four seasons of a year.
By the Qin and Han Dynasties, the 24 solar terms had been completely established. In the book Huai Nan Zi, twenty-four solar terms that are exactly the same as those in modern times began to appear. In BC 104, the calendar compiled by Luo and Deng officially set 24 solar terms in the calendar, and defined the astronomical position of the 24 solar terms.