How many solar terms are there in a year?

24 solar terms is: beginning of spring, rainy, startled, vernal equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Slight Summer, beginning of autumn, Early Summer, White Dew, Autumn Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold.

Extended data:

Twenty-four solar terms refer to the special festivals in the trunk and branch calendars that express seasons, phenology, climate change and the establishment of "December architecture", reflecting the influence of the sun on the earth and being listed in the representative list of human intangible cultural heritage.

Twenty-four solar terms were established in the pre-Qin period in China, and they were completely established in the Han Dynasty to guide farming. 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 divides the sun's annual trajectory into 24 equal parts, and each equal part is a solar term, starting from beginning of spring and ending with the great cold.