How many solar terms are there in a year?

1, there are 24 solar terms in a year: beginning of spring, Rain, Sting, Vernal Equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoshu, Dashu, beginning of autumn, Chushu, Bailu, Autumnal Equinox, Cold Dew, First Frost, beginning of winter, Xiaoxue, Heavy Snow, Winter Solstice, etc.

2. Solar terms are a knowledge system and social practice formed by the ancients by observing the movement of the sun for one year and understanding the changing laws of the four seasons, climate and phenology in a year.

3. The ancient people in China divided the sun's annual trajectory into 24 equal parts, each equal part is a solar term, each solar term has three cycles, and each cycle is five days.

4. The ancients determined the starting point and ending point of the four-season cycle according to the operation law of heaven and earth, and divided it into twenty-four 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".