What is the historical origin of the 24 solar terms?

Since the main political, economic, cultural and agricultural activity centers in China were mostly concentrated in the Central Plains of the Yellow River Basin in history, the 24 solar terms were established according to the climate and phenology in this area.

As early as the Eastern Zhou Dynasty, the Spring and Autumn Period and the Warring States Period, the working people of the Han nationality had the concept of "being far away from the north" and "being far away from the north".

Subsequently, people divided the year into 24 equal parts according to the natural phenomena such as the running position of the sun and the moon at the beginning and middle of the month, the weather and the growth of animals and plants.

And give each equal part a proper noun, that is, twenty-four solar terms.

By the end of the Warring States Period, solar terms had eight names: beginning of spring, Equinox, Long Summer, Summer Solstice, beginning of autumn, Equinox, beginning of winter and Winter Solstice.

These eight solar terms are the most important of the 24 solar terms.

Mark the seasonal changes and clearly divide the four seasons of the year.

By the Qin and Han Dynasties, the 24 solar terms had been completely established.

The book Huai Nan Zi has exactly the same name as the modern twenty-four solar terms.

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.