What is the content of solar term song? When did it appear?

Twenty-four solar terms Song appeared in the Western Han Dynasty.

Since the Western Han Dynasty, the twenty-four solar terms have been used in the solar terms Song Dynasty.

Twenty-four solar term song contents are as follows:

The spring rain shakes the spring and clears the valley, and the summer is full of mountains and summers.

Autumn dew, autumn frost, little snow in winter and cold in winter.

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 Song origin:

As early as the Spring and Autumn Period, people already had the concept of four seasons. During the Warring States Period, Shi Shen, a Wei Ren, compiled the world's first star map with 28 stars and 5 stars, marking the beginning of a new era of astronomy in China.

The solar calendar is calculated according to the time required for the earth to revolve around the sun once. This week is 365 days, 5 hours, 48 minutes and 46 seconds. For convenience, we take 365 days as a year and set up a leap month every four years, increasing the original 28-day February to 29 days.

The lunar calendar takes the cycle of the moon's gain and loss as the calculation unit, which is about 29 days 12 hours, 44 minutes and 4 seconds. Therefore, the big month is 30 days. In order to keep it in line with the cycle of weather changes, one more month has to be added every two or three years. Therefore, China was called "March" in ancient times, and later it used the method of "19 7 leap". At present, under the guidance of science, the setting of leap month is more accurate.

In order to fully reflect the change of seasonal climate, ancient astronomers determined the vernal equinox, summer solstice, autumn equinox and winter solstice as early as the Zhou Dynasty and the Spring and Autumn Period, and divided the whole year into 24 equal parts according to the position change of the sun on the ecliptic and the evolution order of the ground climate caused by it, and named each equal part, which is the origin of the 24 solar terms.

These 24 solar terms are: beginning of spring, Rain, Sting, Vernal Equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoxia, Daxia, beginning of autumn, Chushu, Bailu, Autumn Equinox, Cold Dew, First Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Great Cold. Each solar term is about half a month apart and divided into twelve months. The beginning of the month is called the solar term, and the middle of the month is called "Zhongqi". The so-called "qi" refers to meteorology and climate.