Spring rain shocks spring and clear valley days, summer is full of mountains and summer heat is connected, autumn is exposed with cold and frost, and winter is snowy and snowy. The first half of the year is June 21, and the second half is August 23. The dates of the two festivals are set every month, with a maximum difference of one or two days.

Data expansion:

Solar term is a special festival in the trunk calendar to express the change of natural rhythm and establish "December construction" The 24 solar terms are: beginning of spring, Rain, Sting, Vernal Equinox, Qingming, Grain Rain, long summer, Xiaoman, Mangzhong, Summer Solstice, Slight Summer, Great Summer, beginning of autumn, Chushu, Bailu, Autumn Equinox, Cold Dew, first frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Great Cold.

The 24 solar terms are related to cadres and gossip, and have a long history. In the historical development, the 24 solar terms have been included in the lunar calendar and become an important part of the lunar calendar.

The 24 solar terms are the product of ancient farming civilization, which occupies an extremely important position in China's traditional farming society. Farming production is closely related to the rhythm of nature. It is a knowledge system formed by ancient ancestors who followed the farming season, observed the movement of celestial bodies, and recognized the changing laws of the year, climate, phenology and other aspects.

It scientifically reveals the law of astronomical and meteorological changes, skillfully combines astronomy, agriculture, phenology and folk customs, and derives a large number of related seasonal cultures. Twenty-four solar terms were selected in UNESCO's representative list of human intangible cultural heritage in 20 161month.

Twenty-four solar terms scientifically reveal the law of astronomical and meteorological changes, which skillfully combines astronomy, natural rhythm and folk customs, and derives a large number of related seasonal cultures, which has become an important part of Chinese traditional culture.

In order to express the time series characteristics more accurately, the ancients divided the solar terms into four groups according to the climate and phenology: minute, arrival, opening and closing. The equinox and autumnal equinox are called "dichotomy" in ancient times; The solstice is the summer solstice and the winter solstice, which was called "the second solstice" in ancient times;

Open is beginning of spring and long summer, closed is beginning of autumn and beginning of winter. Beginning of spring, long summer, beginning of autumn, and beginning of winter are collectively called "four Li", which add up to * * * as "eight sections". Folk call it "four seasons and eight festivals" or "eight festivals in the year". In the long farming society, the 24 solar terms have played an important role in guiding farming activities and have rich cultural connotations.