What are the four solar terms of An Gong?

The four solar terms of An Gong are Jingzhi, summer solstice, first frost and winter solstice.

1, quiet

In ancient times, it was called "Enlightenment", which was the third of the 24 solar terms and the beginning of Uzuki in the Ganzhi calendar. The time is between March 5th and 6th in Gregorian calendar, when the sun reaches 345 longitude. The stabbing time is correct between March 5th and 6th in Gregorian calendar. Someone once said that "the time is around the first day of the second lunar month", which is incorrect. The dates of the lunar calendar and the solar calendar are quite different.

2. Summer solstice

It is the tenth of the 24 solar terms. Refers to the afternoon; The longitude of the sun is 90 degrees; The festival will be held on June 2 1 22 of the Gregorian calendar. This summer, the sun shines directly on the ground, directly to the northernmost part of the year, almost directly to the Tropic of Cancer. At this time, the daytime in the northern hemisphere reaches the longest time of the year. For the Tropic of Cancer and its northern region, the summer solstice is also the highest day at noon in a year.

3, the first frost

It means that the weather gets cold and the dew condenses into frost. The first frost is 18 of the 24 solar terms, and it is also the last solar term in autumn. The time is Gregorian calendar1October 23rd to 24th 10.

4. Winter solstice

As a noun with fixed structure and clear semantics, it refers to "one of the twenty-four solar terms" and "December 22nd or 21st every year", which is the most authoritative explanation in Ci Hai.

Climate type

Twenty-four solar terms are the product of agricultural civilization and the knowledge system formed by ancient ancestors by observing celestial movement combined with geographical climate and phenological laws. Agricultural production is closely related to geographical and climatic resources, and superior geographical and climatic resources are important conditions for the birth of agricultural civilization. China is located in the east of Asia-Europe continent and the west coast of the Pacific Ocean, with great differences in thermal properties between land and sea, forming the most typical monsoon climate in the world.

Monsoon climate is a mixture of continental climate and maritime climate. In winter, affected by the dry and cold air flow in the inland, the weather is cold, dry and rainy; In summer, it is hot, humid and rainy because of the warm and humid air currents in the ocean. Sufficient sunshine, abundant precipitation, high temperature and humid rain and heat coexist, which is a very superior climate resource in China. The high temperature period is consistent with the rainy season, and the water and heat are well coordinated, which is very beneficial to the growth of crops.