"Twelve solar term song" Who knows!

Spring rain shocks spring and clear valley days, summer is full of mountains and summer is connected with heat, autumn dew is cold and frost, and winter snow drifts. The two festivals remain unchanged every month, with a maximum difference of one or two days. The first half of the year is June 2 1 day, and the second half is August 23.

Twenty-four solar terms refer to 24 specific festivals in the China lunar calendar, which indicate the changes of seasons. They are made according to the change of the earth's position on the ecliptic, and each one corresponds to a certain position that the earth reaches every time it moves 15 on the ecliptic.

Twenty-four solar terms, a supplementary calendar established in the pre-Qin period and completely established in the Han Dynasty, 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, each equal part is a solar term, and it goes on and on. 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 people's life is the crystallization of the long-term experience and wisdom of the Chinese working people.