How did the ancients in China set the 24 solar terms?

Twenty-four solar terms refer to twenty-four seasons and climate, which is a supplementary calendar made by China in ancient times to guide farming. Used to guide agricultural planting. The traditional summer calendar in East Asia (lunar calendar) is a kind of "combined calendar of yin and yang", which is formulated according to the operation of the day and the month respectively: the part of the month is determined based on the new moon, and the year of the year is determined based on the tropical year (solar year). Each tropical year of the solar calendar is about 365.2422 days, and the 24 solar terms are divided accordingly. -Common sense calendar.