How did the twenty-four solar terms come into being?

People try to divide a solar year into several smaller periods, one is to reflect climate change in detail, and the other is to meet the needs of leap. The result of the exploration was finally determined as 24 solar terms. The twenty-four solar terms were gradually formed on the basis of the sundial measured by the soil. These eight basic points are separation, arrival, opening and closing, which appeared at the latest in the Spring and Autumn Period. Every two points are divided into three sections on average, named after the corresponding meteorological and phenological phenomena. The systematic record of the twenty-four solar terms began with Zhoupian and Huainanzi.