How did the twenty-four solar terms come about? It's all those

Twenty-four solar terms are the original cultural heritage of working people in China, which can reflect the changes of seasons, guide agricultural activities and affect the food, clothing, housing and transportation of thousands of households. Since 2000, the main political activity center in China has been concentrated in the Yellow River Basin, and the 24 solar terms have been established on the basis of the climate and phenology in this area. Due to the vast territory and changeable terrain of China, the 24 solar terms are only a reference for many regions.

The twenty-four solar terms are divided according to the position of the sun on the ecliptic (that is, the orbit of the earth around the sun). Depending on the sun starting from the vernal equinox (longitude zero, at this moment the sun shines vertically on the equator), every advance of 15 degrees is a solar term; After a week's operation, I returned to the vernal equinox, which is a tropical year with 360 degrees, so it is divided into 24 solar terms. The dates of solar terms are relatively fixed in the solar calendar. For example, beginning of spring in the solar calendar always falls between February 3rd and 5th. However, in the lunar calendar, the date of solar terms is not easy to determine. Take beginning of spring as an example. It can be the first day of the lunar calendar in the previous year, 65438+February 15, and the latest is the first month, 15. The current lunar calendar is neither a lunar calendar nor a solar calendar, but a combination of lunar and solar calendars. There is a leap month in the lunar calendar. If one year is counted from the first day of the first month to the New Year's Eve of the twelfth month, the number of days in the lunar calendar varies greatly (leap year is 13 months). In order to standardize the number of years, the first day of the Lunar New Year (heavenly stems and earthly branches) is not the first day of the first month, but beginning of spring. In other words, a year in the lunar calendar is the day before from beginning of spring in that year to beginning of spring in the following year. For example, 2008 is the fifth year of the lunar calendar. The first day of Wuzi began not on February 7, 2008 (the first day of the first lunar month), but on February 4, 2008 in Gregorian calendar.

24 gas meters

(Calculated according to AD date)

72 kinds of climate

In seasons and months, the sun reaches the first, second and third ecliptic.

In spring, Meng Chun Li Chun 3 15 east wind thawed stinging insects and began to shake the fish on the ice.

3-5 February

Rain and dew water 330 peach blossom warehouse is more bright.

February 65438, 2008

Mid-spring, 345 Rex sacrificed fish, Hongyan came, and the plants sprouted.

5-7 March

At 0 vernal equinox, the black bird began to make a sound.

March 20 -2 1

Ji Chun Qingming 15 The stone vole turned into a rainbow.

April 4-6

When it rains at 30 degrees in the valley, pigeons start singing and blowing feathers. Dai Sheng falls.

April 19-2 1

In summer, Xia Meng began to cry in the summer of 45 degrees, and the earthworm grew into a melon.

5-7 May

A bitter vegetable 60 degrees smaller will show off its grass in summer.

20-22 May

In midsummer, the 75-degree mantis species began to sing, and its tongue was silent.

5-7 June

In the summer of solstice, Pinellia ternata will be born only when antlers are removed at a high temperature of 90 degrees.

June 2 1-22

It learned a cricket's residence from the mild Xia Feng in 105 in the last month of summer.

6-8 July

120 When rotten grass turns into firefly soil in the hot summer, it will only be rainy in the hot summer.

July 22nd-24th

Autumn, Meng, autumn, autumn, 135, cool breeze to white dew, chilling.

August 7-9

/kloc-in the summer of 0/50, the eagle is the first place to worship birds.

22-24 August

Mid-Autumn Egrets 165 Hongyan came to the mysterious flock to raise shame.

7-9 September

At the autumnal equinox of 180, thunder began to ring and the water dried up.

22-24 September

The cold dew in season and autumn is 195. Red rock guest birds attack floods, chrysanthemums bloom yellow flowers.

65438+18 -9 October

First frost 2 10 is a sacrifice to animals, plants, yellow leaves, stinging insects and salt water.

65438+123 -24 October

In winter, in the middle of winter, the water begins to freeze, and pheasants enter the water to be storks.

165438+17-8 October

Snow is hidden in a rainbow of 240 degrees, and the weather is blocked, so it becomes winter.

165438+1On October 22-23, the geogas decreased.

It snows at 255 degrees in the middle of winter. Birds don't call tigers, so it's quite healthy to make friends with them.

65438+6 -8 February

The spring moves at an angle of 270 degrees with the winter solstice.

65438+February 2 1-23

It was a slight cold in winter at 285 degrees, and magpies began to nest in the north.

65438+15 -7 October

In the 300-degree cold, chickens began to nurse, birds became seriously ill, and Shui Ze's abdomen was very strong.

65438+1October 20 -2 1.