What is the knowledge about the 24 solar terms?

Twenty-four solar terms are a time knowledge system formed by observing the annual movement of the sun in China. In the field of international meteorology, it is known as "the fifth invention of China". 2016165438+1October 30th, China's "Twenty-four solar terms" was officially listed in UNESCO's representative list of human intangible cultural heritage.

Twenty-four solar terms are special festivals in the dry calendar, indicating the change of natural rhythm and establishing "December construction". At first, it was based on the movement of stars. The Big Dipper rotates circularly, and bucket handle rotates around the east, south, west and north, which is called one of the "years old" (Figure). Each rotation cycle begins in early spring and ends in severe cold. The current "twenty-four solar terms" are formulated according to the position of the sun on the return to the ecliptic, that is, the annual movement track of the sun is divided into 24 equal parts, each 15 is 1 equal part, and each 1 equal part is a solar term, starting from beginning of spring and ending from the severe cold. "Twenty-four solar terms" is an important part of the long history and culture of the Chinese nation, which embodies the historical and cultural essence of Chinese civilization.