When did the twenty-four solar terms in China come into being?

Twenty-four solar terms, a supplementary calendar formulated by China to guide farming in ancient times, are the crystallization of the long-term experience and wisdom of the Han working people in ancient China, which was formed in the Spring and Autumn Period and the Warring States Period.

As early as the Eastern Zhou Dynasty, the Spring and Autumn Period and the Warring States Period, the working people of the Han nationality had the concept of "being far away from the north" and "being far away from the north". Subsequently, people divided the year into 24 equal parts according to the natural phenomena such as the running position of the sun and the moon at the beginning and middle of the month, the weather and the growth of animals and plants. And give each equal part a proper noun, that is, twenty-four solar terms.