Are the 24 solar terms divided by solar calendar or lunar calendar?

The twenty-four solar terms reflect the influence of the sun on the earth and belong to the solar calendar category.

Twenty-four solar terms are a knowledge system formed by observing the movement of the sun in a year and understanding the changing laws of the four seasons, climate and phenology in a year. It not only plays a guiding role in agricultural production, but also affects the food, clothing, housing and transportation of ancient people, and even cultural concepts.

The current lunar calendar absorbs the solar terms of the trunk calendar as a supplement to the calendar, and is adjusted to conform to the tropic year through the leap method, forming a combined calendar of yin and yang.

Extended data:

Twenty-four solar terms are special festivals in the dry calendar that express seasons, phenology, climate change and the establishment of "December construction". Initially determined by the bucket handle direction of the Big Dipper, bucket handle rotates around the east, south, west and north for a period of time, which is called one of the "years old" (photo); Every rotation cycle starts from beginning of spring and ends with the Great Cold.

The current "twenty-four solar terms" are divided by "constant gas method", that is, each solar term corresponds to a certain position that the earth reaches every time it runs 15 on the ecliptic; The method of "fixing qi" divides the sun's annual movement track into 24 equal parts, each equal part is 15, and each equal part is a solar term, which starts from beginning of spring and ends with severe cold.

"Twenty-four solar terms" express the unique concept of time between human beings and the natural universe, and contain the long-standing cultural connotation and historical accumulation of the Chinese nation.