When was the twenty-four solar terms schedule determined?

The schedule of the 24 solar terms is as follows:

1, spring

Beginning of spring: February 3 -5; Rain: February18-20; Stunned: March 5-7; Equinox: March 20-22; Qingming: April 4 -6; Grain Rain: April19—April 2 1.

2. Summer

Long summer: May 5 -7; Xiaoman: May 20-22; Mango seeds: June 5 -7; Summer solstice: June 21-22; Slight heat: July 6-8; High temperature in summer: July 22nd to 24th.

3. Autumn

Beginning of autumn: August 7-9; Summer: August 22-24; Millennium: September 7 -9; Autumnal equinox: September 22-24; Cold dew: 65438+1October 8-9; First frost:1October 23rd-24th.

4. Winter

Beginning of winter: 65438+1October 7-8; Xiaoxue:165438+1October 22-23; Heavy snow: 65438+February 6-8; Winter solstice: 65438+February 21-23; Slight cold: 65438+1October 5-7; Great cold: 65438+1October 20 -2 1.

The 24 Solar Terms

Twenty-four solar terms are special festivals in the calendar to express natural rhythm changes and establish "December construction". Four years old, three months in spring, summer, autumn and winter, two solar terms each month, each solar term has its own unique meaning. Twenty-four solar terms accurately reflect the change of natural rhythm and play an extremely important role in people's daily life. It is not only a seasonal system that guides agricultural production, but also a folk system that contains rich folk customs.

"Twenty-four solar terms" is the product of ancient farming civilization. It is a knowledge system formed by ancient ancestors following the farming season and observing the movement of celestial bodies to understand the changing laws of seasons, climate and phenology in a year. The current "twenty-four solar terms" are formulated according to the position of the sun on the return to the ecliptic, that is, the annual movement track of the sun is divided into 24 equal parts, each 15 is 1, and each 1 is a solar term, starting in beginning of spring and ending in severe cold.