1, origin: solar terms are the product of ancient farming civilization, which was originally formulated according to the shifting of stars. The ancients guided agricultural production according to the direction of the Big Dipper in the night sky. During the period of Emperor Wu of the Western Han Dynasty, the "Twenty-four solar terms" were included in the taichu calendar as a supplement to the calendar guiding farming, and the solar terms were measured in the Yellow River basin by using the standard table mapping method.

2. Meaning: Solar term is a specific festival in the calendar that indicates the change of natural rhythm and establishes "December" (monthly order). The 24 solar terms are: beginning of spring, Rain, Sting, Vernal Equinox, Qingming, Grain Rain, long summer, Xiaoman, Mangzhong, Summer Solstice, Slight Summer, Great Summer, beginning of autumn, Chushu, Bailu, Autumn Equinox, Cold Dew, first frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Great Cold.

The value of twenty-four solar terms

Twenty-four solar terms have the prompt significance of time marking and seasonal transformation. The labeling and use of the twenty-four solar terms means that China keeps pace with the world rhythm while retaining its own characteristics and elements.

Not only that, the name of the 24 solar terms itself relates the circulation of time to the changes of climate and phenology, and 8 of them reflect the seasonal changes (that is, dichotomy to fourfold); Five reflect the temperature changes (i.e. slight summer heat, severe summer heat, summer heat, slight cold and severe cold).

Seven reflect the changes of precipitation (i.e. rain, Grain Rain, white dew, cold dew, first frost, light snow and heavy snow), and four reflect the changes of phenology (i.e. fright, Qingming, xiaoman and mang), so it has a distinct hint of seasonal change, which is a feature and advantage that the Gregorian calendar does not have.

Reference to the above content: Baidu Encyclopedia-the origin of the 24 solar terms