Where did the twenty-four solar terms originate?

"Twenty-four solar terms" were formed in the Yellow River Basin of China. The stargazing platform in the World Cultural Heritage "Historical Architecture of Heaven and Earth" (34 N) in Henan Province is the most direct historical evidence of the 24 solar terms. Here is a 700-year-old "celestial ruler", which is used to measure the midday sun shadow, and can determine the solar terms and the duration of a year. Today, the 24 solar terms still have a far-reaching impact on people's lives and agricultural production activities.

Only areas with four distinct seasons can meet the conditions of producing twenty-four solar terms. The Central Plains region with Luoyang and Kaifeng in Henan as the core, namely the middle and lower reaches of the Yellow River, has four distinct seasons. At the same time, this area is also the origin of primitive agriculture. Because the Pleistocene was stimulated by cold, people sprouted concept agriculture. After Holocene, primitive agriculture came into being in this area, which had both objective and subjective conditions.