What are the 24 solar terms calculated based on?

Twenty-four solar terms are based on shifting 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 guide the agricultural calendar, and the solar terms were measured in the Yellow River basin by the standard chart drawing method.

The meaning of the twenty-four solar terms: solar terms are special festivals that express the natural rhythm changes in the dry calendar and establish the "December construction" (monthly order). The 24 solar terms are: beginning of spring, Rain, Sting, Equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoxia, Daxia, beginning of autumn, Early Summer, Bailu, Autumn Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold.

Song formula of twenty-four solar terms

Spring rain shocks spring and clear valley days, summer is full of mountains and summer is connected with heat, autumn dew is cold and frost, and winter snow drifts. The two festivals have not changed every month, with a difference of one or two days at most. The first half of the year is June 2 1 day, and the second half is August 23. This song is compiled according to the law of names for the convenience of memory. The first four sentences are composed of one word in each solar term in sequence, which is the main body of the whole solar term song, and the last four sentences are the time laws of the 24 solar terms.

The important value of the twenty-four solar terms

1. Traditional cultural value: The 24 solar terms are an important part of China's traditional culture, reflecting China people's observation, perception, cognition and evaluation of nature.

2. The value of agricultural production: The division of the 24 solar terms provides an important time basis for agricultural production in China. Farmers can decide their own agricultural activities according to the changes of the 24 solar terms, including farming, sowing and harvesting.

3. The value of TCM health care: The 24 solar terms are closely related to human physiology, meteorological environment and disease prevention. Traditional Chinese medicine believes that there is a close relationship between human body and nature, and adjusting the way of life and diet to adapt to the changes in solar terms is conducive to good health.

4. Eco-environmental value: The 24 solar terms are an important basis for people to understand and master the natural environment. People can adjust their life and production methods reasonably according to the changes of the 24 solar terms, so as to reduce the damage of human beings to the natural environment.