Are the 24 Solar Terms divided according to the solar or lunar calendar?

By solar calendar

The 24 solar terms reflect the influence of the sun on the earth, and belong to the category of solar calendar.

The 24 solar terms are a system of knowledge formed by observing the annual movement of the sun and recognizing the patterns of change in the seasons, climate, and physical conditions of the year. It not only plays a guiding role in agricultural production, but also influences ancient people's clothing, food, housing and transportation, and even cultural concepts.

The lunar calendar now in use has absorbed the festival component of the dry calendar as a supplement to the calendar, and through the "intercalary" adjustment to make it consistent with the year of return to form the yin and yang calendar.

Expanded Information:

The twenty-four solar terms are the seasons, climatic conditions, and climatic changes in the Chinese calendar, as well as the establishment of the "twelve months of the lunar calendar". It was initially determined by the pointing of the handle of the Big Dipper, which rotates around east, south, west, and north once for a cycle called a "year" (摄提); each rotational cycle begins with the beginning of spring and ends with the end of the Great Cold.

The current "twenty-four solar terms" are divided into "fixed qi", that is, each solar term corresponds to a certain position reached by the Earth in the ecliptic for every 15 °; "fixed qi method "The sun's annual trajectory is divided into 24 equal parts, every 15 ° for one equal part, each equal part for a festival, starting in the spring, and finally the big cold, week after week.

The "24 Solar Terms" expresses the unique concept of time between man and the natural universe, and contains the long cultural connotation and historical accumulation of the Chinese nation.