How to calculate the 24 solar terms according to time

How are the 24 solar terms formed? We know that the earth goes around the sun for about 365 days and more than five hours, running 940 million kilometers. This orbit is called the ecliptic and is divided into 360 degrees. Divide 360 into 24 equal parts, and each minute is 15, which is a solar term. The number of days between two solar terms is about 15 days, that is, there are 24 solar terms throughout the year.

When the sun shines directly on the equator of the earth, the northern and southern hemispheres are equally divided day and night, and the solar meridian where the earth is located is 0 vernal equinox and 180 autumnal equinox respectively. Starting from the vernal equinox 0, every 15 is a solar term, and the period is exactly 360 from the vernal equinox.

The solar ecliptic of the earth in the twenty-four solar terms

Solar terms, solar ecliptic, lunar date

Beginning of spring 31524 (5,6)

Rainwater 330 2 19(20)

Sting 345 3 6(5)

Vernal equinox 360 3 2 1(20, 23)

Qingming1545 (4,6)

Grain Rain 30 4 20(2 1, 23)

Long summer 45 5 6(5, 7)

Xiaoman 60521(20,22)

Mango 7566 (5,7)

Summer solstice 90 6 22(2 1)

Xiao Shu 105 7 7(8)

Summer 120 7 23(24)

Beginning of autumn13588 (7,9)

Summer 150 8 23(24)

Millennium16598 (7,9)

Autumnal Equinox 180 9 23(24)

Cold dew 195 10 8(9)

The first frost 2 10 10 24(23)

Beginning of winter 225 1 1 8(7)

Xiaoxue 240 1 1 23(22)

Heavy snow 255 12 7(8)

Winter solstice 270 12 22(23)

Xiaohan 285 1 6(5)

Dahan 300 1 20(2 1)