Knowledge of the twenty-four solar terms of the lunar calendar.

24 solar terms refers to the 24 specific solar terms in the China lunar calendar, which are formulated according to the change of the earth's position on the ecliptic (that is, the earth's orbit around the sun), and each solar term corresponds to a certain position reached by the earth every time it runs 15 on the ecliptic.

Twenty-four solar terms, a supplementary calendar, were established in the pre-Qin period in China and completely established in the Han Dynasty to guide farming. It is 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 divides the sun's annual trajectory into 24 equal parts, and each equal part is a solar term, starting from beginning of spring and ending with severe cold. It is not only a time standard promulgated by successive governments, but also a compass to guide agricultural production. The compass for predicting cold, warm, rainy and snowy weather in daily life is the crystallization of the long-term experience and wisdom of the working people of the Han nationality.

2016165438+1October 30th, 24 solar terms were officially listed in UNESCO's Representative List of Intangible Cultural Heritage of Humanity.