When did the solar term Song come out?

Twenty-four solar term song was written by a visiting professor from 1949 in People's Daily.

"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 our country. So far, many versions have been circulated, and the common one is the visiting professor version. 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.

24 solar term song's content is:

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 were established in ancient times. The rotation of the Big Dipper is closely related to the change of seasons. The current twenty-four solar terms come from the law of fixed space more than 300 years ago, that is, the time for the sun to run once every 15 degrees along the yellow meridian from zero degree is called "a solar term".