When did the twenty-four solar terms in China begin to appear?

Among the 24 solar terms in China, Song first appeared in the Spring and Autumn Period and the Warring States Period.

Twenty-four solar terms originated in the Yellow River Basin, which is the crystallization of the long-term experience and wisdom of the ancient working people in China. As early as the Spring and Autumn Period, people already had the concept of four seasons, namely, midsummer, midsummer, midsummer and midsummer. The twenty-four solar terms reflect the influence of the sun on the earth and belong to the solar calendar category. It is the crystallization of the long-term experience and wisdom of the ancient working people in China.

Twenty-four solar terms are the guide of agricultural production, which put forward clear time requirements for all aspects of agricultural production, thus forming a basic rhythm of life in which "farming leisure" and "farming busy" alternate, and on this basis, it has had an important impact on the overall time arrangement of social, cultural and entertainment life in traditional rural areas and even towns. Today, the concept of "farming season" still plays a guiding role in production, marking different periods of social life, showing a rich and colorful life pattern and becoming an important symbol of the inheritance of local farming culture.