Are the 24 solar terms a tradition in China or imported from abroad? Why do I feel that the 24 solar terms seem to correspond to the solar calendar?

Twenty-four solar terms refer to twenty-four seasons and climates. Twenty-four solar terms is a supplementary calendar made by China to guide farming in ancient times, and it is the crystallization of the long-term experience and wisdom of the Han working people in ancient China. It was formed in the Spring and Autumn Period and the Warring States Period.

Because the lunar calendar in China is a kind of "yin and yang calendar", which is based on the movement of the sun and the moon, it can't fully reflect the solar cycle. But China is an agricultural society, and agriculture needs a strict understanding of the movement of the sun, so farming is entirely based on the sun. Therefore, the "twenty-four solar terms" that reflect the solar cycle alone are added to the calendar as the standard for determining leap months. Twenty-four solar terms can reflect the changes of seasons, guide agricultural activities and affect the food, clothing, housing and transportation of thousands of families. The twenty-four solar terms are divided according to the position of the sun on the ecliptic (that is, the orbit of the earth around the sun). [ 1]

On May 20th, 2006, "Twenty-four solar terms" as a folk custom project was approved by the State Council to be included in the first batch of national intangible cultural heritage list. April 20 14, the Ministry of Culture of China officially began to declare the "24 solar terms" to UNESCO's "Intangible Cultural Heritage of Humanity".

Therefore, it must belong to our own country.