The meaning of 24 solar terms and the introduction of 24 solar terms.

1. According to the position of the sun on the ecliptic, the whole year is divided into 24 periods, namely: beginning of spring, Rain, Scaring, Equinox, Qingming and Grain Rain; Long summer, Xiaoman, Mangzhong, Summer Solstice, Xiaoshu, Dashu; Beginning of autumn, Chu Shu, Bailu, Autumnal Equinox, Cold Dew, First Frost; Beginning of winter, light snow, heavy snow, winter solstice, slight cold and severe cold are collectively called the 24 solar terms.

2. Twenty-four solar terms indicate climate change and farming season, which China used to guide agricultural production in the 2nd century BC.

3. Twenty-four solar terms are special festivals in the trunk calendar, indicating the change of natural rhythm and establishing "December construction". At first, it was based on the movement of stars. The Big Dipper rotates circularly, and bucket handle rotates around the east, south, west and north, which is called one of the "years old" (Figure). Each rotation cycle begins in early spring and ends in severe cold.

4. The current "twenty-four solar terms" are formulated according to the position of the sun on the ecliptic, that is, the annual movement track of the sun is divided into 24 equal parts, each 15 is 1 equal part, and each 1 equal part is a solar term, starting from beginning of spring and ending from the great cold. "Twenty-four solar terms" is an important part of the long history and culture of the Chinese nation and embodies the historical and cultural essence of Chinese civilization.