The 24 solar terms mainly reflect the climate in the middle and lower reaches of the Yellow River.

The twenty-four solar terms mainly reflect the climate of the middle and lower reaches of the Yellow River with Luoyang to Kaifeng as the center. Twenty-four solar terms originated in the Yellow River Basin. As early as the Spring and Autumn Period, four solar terms were set, namely, mid-spring, mid-summer, mid-autumn and mid-winter.

After continuous improvement and perfection, by the Qin and Han Dynasties, the 24 solar terms had been completely established. In BC 104, the taichu calendar written by Deng Ping officially set 24 solar terms in the calendar, and defined the astronomical position of the 24 solar terms.

"Twenty-four solar terms" is the product of ancient farming civilization, and farming production is closely related to the rhythm of nature. It is a knowledge system formed by ancient ancestors who followed the agricultural time to observe the movement of celestial bodies and realized the changing laws of one year, climate and phenology. Each solar term represents different changes in time, climate and phenology.