In which country was the division and arrangement of the 24 solar terms determined?

In addition, the division and arrangement of the 24 solar terms were completed during the Warring States Period. Even today, 24 solar terms is more important to farmers in China than the Gregorian calendar. China is an agricultural country, and the calendar is very important for agriculture. If necessary, it will develop. Later emperors also regarded the revision of the calendar as a major event related to their own rule. But ancient astronomy was observed and studied under the guidance of geocentric cosmology.