Related knowledge of the twenty-four solar terms

According to the law of the operation of heaven and earth, the ancients determined the starting point and ending point of the four-season cycle and divided the 24 solar terms. The trajectory of the sun in a year is divided into 24 equal parts, each of which is a "solar term", collectively called "twenty-four solar terms". Twenty-four solar terms represent twenty-four different positions of the earth in the orbit of revolution. Because it takes 365 days for the earth to go around the sun, there is a solar term every fifteen days, and each solar term represents different changes in climate, phenology and time.

I. Classification of Twenty-four Solar Terms

Twenty-four solar terms are the accumulation of long-term experience and the crystallization of wisdom of working people in ancient China. It is divided into the following 24 kinds:

Beginning of spring, Rain, Creeping, Vernal Equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoshu, Dashu, beginning of autumn, Chushu, Bailu, Autumnal Equinox, Cold Dew, Chufrost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold.

"Spring rain surprised spring clear valley days, summer full mans summer heat connected. Autumn frost, winter snow. " This song "solar term song", which is well known to China people, implies the order of the 24 solar terms.

Second, a little common sense about the 24 solar terms.

1. beginning of spring and Great Cold

They are in the 24 solar terms.

The first qi and the last solar term.

There are two solar terms every month.

There is a solar term every fifteen days.

3. vernal equinox and autumnal equinox

The sun shines directly on the equator,

Equal distribution of day and night,

On the same day.

12 hour day 12 hour night

On the summer solstice, the sun shines directly on the Tropic of Cancer.

On that day, the northern hemisphere reached a year.

The longest day,

Reach the southern hemisphere

The longest night is one day;

The solstice in winter is just the opposite.

On the solstice of winter, the sun shines directly on the tropic of Capricorn.

On that day, the northern hemisphere reached a year.

The longest day of the night,

Reach the southern hemisphere

The longest day of the day.

4.24 Solar terms began in the Eastern Zhou Dynasty, the Spring and Autumn Period and the Warring States Period.

Founded in the Qin and Han Dynasties.

5. The hottest solar term is the summer heat;

The coldest solar term is the great cold.