What are the 24 solar terms?

The twenty-four solar terms refer to beginning of spring, rain, sting, vernal equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoxia, Daxia, beginning of autumn, Chuxia, Bailu, Autumnal Equinox, Cold Dew, Chufrost, beginning of winter, light snow, winter solstice, slight cold and severe cold.

Twenty-four solar terms are special festivals in the elephant trunk calendar that express the change of natural rhythm and establish December. They are: beginning of spring, Rain, Sting, Spring Equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoshu, beginning of autumn, Chushu, Bailu, Autumn Equinox, Cold Dew, First Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold.

At first, it was based on the change of stars. The Big Dipper rotates in cycles, and bucket handle rotates clockwise once, which is called one year old (Figure). The current 24 solar terms are based on the position of the sun on the ecliptic (the earth's orbit around the sun), that is, the sun's annual trajectory is divided into 24 equal parts, each 15? Equal to 1, each equal to 1 is a solar term, which begins in the beginning of spring and ends in the great cold. Each solar term is about half a month apart and divided into twelve months. There are two solar terms every month.

Twenty-four solar terms are the product of ancient farming civilization, and farming production is closely related to the rhythm of nature. It is a knowledge system formed by ancient ancestors following the farming season and observing the movement of celestial bodies to understand the changing laws of seasons, climate and phenology in a year. Each solar term represents different changes in climate, phenology and time. In the historical development, the 24 solar terms have been incorporated into the lunar calendar and become an important part of the lunar calendar.