Who discovered the formula of the twenty-four solar terms when? What is the principle?

Twenty-four solar terms, a supplementary calendar to guide farming in ancient China, were formed in the Spring and Autumn Period and the Warring States Period. The 24 solar terms belong to the lunar calendar, but they are divided according to the position of the sun. That is, according to the position of the sun on the ecliptic, a year is divided into 24 equal parts. That is to say, the ecliptic is divided into 24 equal parts, and each equal part accounts for 15 degrees of the longitude of the Yellow River. Because the time required for the sun to pass through each bisection is almost equal, the Gregorian calendar dates of the 24 solar terms are roughly the same: the first half of the year is around 6 and 2 1, and the second half is around 8 and 23.