In the spring and autumn period, the book Shangshu recorded the solar terms. There is a complete record of 24 solar terms in Huai Nan Zi written by Liu An in the Western Han Dynasty.
Basis for dividing the 24 solar terms: The 24 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 vernal equinox (longitude zero, at this moment the sun shines vertically on the equator), every forward 15 degrees is a solar term; After a week's operation, I returned to vernal equinox, which is a tropical year, which is 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 is always between February 3rd and 5th in the solar calendar. However, in the lunar calendar, the date of the solar term is not easy to determine. Take beginning of spring as an example, it can be on1February 15 of the previous year's lunar calendar and on 15 of the first month at the latest.
Meaning of the 24 solar terms: beginning of spring: Standing is the beginning, and beginning of spring is the beginning of spring.
Rain: The rain begins and increases gradually.
Sting: Sting means hiding. Sting refers to the sudden movement of spring thunder, which awakens the animals dormant in the soil and hibernating.
Equinox: Equinox means equal share. The vernal equinox means that day and night are equally divided.
Qingming: It's sunny and lush.
Grain Rain: Rain makes a hundred valleys. With sufficient and timely rainfall, cereal crops can thrive.
Long summer: The beginning of summer.
Xiaoman: The grains of wheat summer crops begin to be full.
Miscanthus species: awned crops such as wheat are mature.
Summer Solstice: The hot summer is coming.
Summer heat: Summer heat means heat. A slight summer heat is when the climate starts to get hot.
Big agency: the hottest time of the year.
Beginning of autumn: The beginning of autumn.
Summer heat: place means to stop and hide. Summer is the end of a hot summer day.
White dew: The weather turns cold, and the dew is condensed and white.
Autumnal equinox: divided equally between day and night.
Cold dew: dew is cold and will freeze.
First frost: It's getting colder and frosty.
Beginning of winter: The beginning of winter.
Xiaoxue: It began to snow.
Heavy snow: the snowfall is increasing, and there may be snow on the ground.
Winter Solstice: The cold winter is coming.
Slight cold: The climate began to get cold.
Great cold: the coldest time of the year.