Who invented the 24 solar terms and when?

Who invented the twenty-four solar terms: Liu An, King of Huainan.

Twenty-four solar terms are great inventions and creations of ancient people in China. It is the earliest complete and scientific record, which comes from Huainanzi Astronomical Training written by Liu An, King of Huainan in the Western Han Dynasty.

Twenty-four solar terms are an eternal calendar based on the bucket handle of Beidou, the sun, the moon, the degrees marked by the twenty-eight nights, the December season, the twelve-tone rhythm and the law of the earth's movement. In the first year of Emperor Wu of the Han Dynasty (BC 104), the 24 solar terms were compiled into taichu calendar and promulgated throughout the country, spreading for more than 2,000 years.

The influence of the twenty-four solar terms:

Twenty-four solar terms and protection of ecological resources. As an agricultural country, the Chinese nation pays special attention to the protection of natural resources in order to continuously obtain the means of subsistence.

"Time for Training" said: "Meng Chunyue, no logging, no nesting, killing the fetus and leaving no eggs." When spring comes and everything recovers, three things should be forbidden: not cutting down trees; It is forbidden to kill pregnant animals, including elk and deer; It is not allowed to destroy the nest or the reproduction of birds. In other words, creatures in the growth and development stage are not allowed to hunt and destroy.