The precession of the sun will change

There are two solar terms in each month in the first half of the year. The former solar term is about 6 days, while the latter solar term is about 2 1 day, with a difference of 1~2 days. There are two festivals every month in the second half of the year, the first one is around the 8th, and the second one is around the 23rd, with a difference of 1~2 days.

"Twenty-four solar term song" is a small poem compiled for the convenience of remembering the twenty-four solar terms in the ancient calendar of China, and there are many versions circulating. Solar terms refer to the 24 solar terms and climate. It is a calendar made in ancient China to express seasonal changes and guide farming. It is the crystallization of the long-term experience and wisdom of the ancient working people in China.

Related content explanation

Twenty-four solar terms refer to 24 specific seasons in the solar calendar, which are formulated according to the change of the position of the earth on the ecliptic (that is, the orbit of the earth around the sun), and each solar term corresponds to a certain position that the earth reaches every time it runs 15 on the ecliptic.

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 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 the great cold.

The twenty-four solar terms were formulated by the ancients according to the ecliptic plane, which reflected the influence of the sun on the earth and belonged to the solar calendar category. It is an important part of the long history and culture of the Chinese nation and embodies the historical and cultural essence of Chinese civilization. Twenty-four solar terms were established in ancient times, and were absorbed into taichu calendar law in Han Dynasty as a supplementary calendar to guide farming. Twenty-four solar terms are not only the time criterion promulgated by successive governments, but also the compass to guide agricultural production and to predict cold, warm, snow and rainy days in people's daily life.