The origin of the twenty-four solar terms

The origin of the 24 solar terms is as follows:

The current "twenty-four solar terms" originated from the method of dividing according to the longitude of the sun more than 300 years ago, and it has been used since 1645.

From the date of the constitutional calendar, the lunar calendar and the twenty-four solar terms are determined according to the position of the sun on the ecliptic, that is, on a 360-degree circle of the ecliptic, it is divided into 24 equal parts, one for every 15, starting with the spring divided into 0 degrees, and arranged according to the degrees of the ecliptic.

Introduction of 24 solar terms:

It is the product of ancient farming civilization and contains the long-standing cultural connotation and historical accumulation of the Chinese nation. It was originally formulated according to the shift of stars, and the ancients guided agricultural production according to the direction of the Big Dipper in the night sky. During the period of Emperor Wu of the Western Han Dynasty, the "twenty-four solar terms" were included in the taichu calendar as a supplement to guide the agricultural calendar, and the solar terms were measured in the Yellow River basin by the standard chart drawing method.

The current "twenty-four solar terms" came from more than 300 years ago according to the degree of the yellow sun of the sun. In the historical development, the "24 solar terms" have been incorporated into the lunar calendar and become an important part of the lunar calendar.