What are the three stages of winter solstice, slight cold and severe cold?

Winter solstice (English: winter solstice), also known as winter festival and happy winter, is one of the twenty-four solar terms and one of the eight astronomical solar terms, as opposed to summer solstice. The solstice in winter is the shortest day in a year. The winter solstice in the northern hemisphere is generally between 65438+February 2 1 and 65438+February 23, and 1 1 month is defined by the month of winter solstice in China calendar.

2, slightly cold

The slight cold is the 23rd solar term in 24 solar terms, which is between 65438+/kloc-0 and October 5-7 every year, and the sun is located at 285. For China, it's around March 9th, and the slight cold marks the beginning of the coldest day of the year. According to the meteorological data of Chinese mainland, slight cold is the lowest temperature solar term [1], and only a few years have great cold temperatures lower than slight cold. [2]

3. Great cold

The Great Cold is the last of the 24 solar terms, and it is between 1, 19 and 2 1 every year. [1] The sun is at 300. Affected by the cold current from Siberia, East Asia is usually the coldest period of the year. In some parts of China, severe cold is not as cold as slight cold, but in some years and a few coastal areas, the lowest temperature in the whole year will still appear in the severe cold solar terms.

Extended data

The development of the twenty-four solar terms

The trunk calendar, also known as the solar calendar or China solar calendar, is a calendar marked by 60 different groups of heavenly stems and earthly branches. Ganzhi calendar has a long history, extensive and profound, and contains profound cosmic astrological codes.

The trunk calendar is mainly composed of four parts: trunk calendar year, trunk calendar month, trunk calendar day and trunk duration. "Twelfth Construction" and "Twenty-four Solar Terms" are its basic contents. Wan, a famous historian in Ming Dynasty, determined that the main branch was invented by the emperor according to the clear records in the ancient documents of China.

The current 24 solar terms are a knowledge system formed by observing the movement of the sun for a year and understanding the changing laws of seasons, climate and phenology in a year. It divides the orbit of the sun in one year into 24 equal parts, corresponding to a certain position reached by the sun every time it runs 15 on the ecliptic, and each equal part is a "solar term".

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