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What does the 24 solar terms mean? The meaning of cold solar terms and cold phenology

China's 24 solar terms are based on the lunar calendar, so even if 2018 has passed, there are still two solar terms in the 2018 lunar calendar, namely, slight cold and severe cold. After these two solar terms, winter will slowly pass and spring will come. What does the great cold solar term mean? The name means very cold. This article brings you the meaning and phenology of the great cold in the 24 solar terms. Let's learn about the great cold!

What does the 24 solar terms mean

It is cold around January 21 every year. Great cold is a solar term that reflects the process and degree of temperature rise and fall. The severe cold is colder than the minor cold. It is the coldest season of the year. Cui Lingen of the Liang Dynasty wrote the three rites and righteousness sect, which said: "the cold is against the extreme, so it is called great cold."

Originally, during the winter solstice, the sun shines directly on the Tropic of cancer. In China in the northern hemisphere, the day is the shortest, the night is the longest, the ground receives the least light and heat, and the weather should be the coldest, but the actual cooling is during the light cold and great cold Festival after the winter solstice, that is, the so-called "cold in March and September". This is because during the great cold Festival, although the days are slightly longer than the winter solstice, the days are still short and the nights are long. The heat radiated from the sun to the ground is less than that radiated from the ground to the air, so the temperature continues to decline. In addition, the cold waves from the polar, Siberian and Mongolian Plateau frequently go south at this time, constantly invading vast areas of China, promoting the emergence of the lowest temperature of the whole year.

Cold phenology

Chicken milk - in ancient times, people hatched hens and chicks, which was called 'chicken milk'. What does cold mean? According to the explanation of the ancients, poultry chickens should hatch chicks before the beginning of spring and take shape with the growth of Yang Qi. Therefore, since ancient times, people have regarded 'chicken milk' as a response to the cold solar term.

In ancient times, in the practice of social life, it was found that every year in the cold solar term in winter, birds such as eagles were in a state of strong predation ability, circling in the air every day looking for food to supplement the body's energy to resist the cold winter. Because these birds reflect the regular changes of solar terms more prominently, since ancient times, people have summarized this phenomenon as' severe disease of birds' as the waiting for the second phase of the cold solar terms.

In ancient times, it was found that the ice in the water was the strongest in winter. The size is also the thickest. Therefore, the ancients mostly took ice in the light cold and severe cold. Put it in the ice cellar for summer. Therefore, since ancient times, people have summarized the reflection of water on the regular changes of solar terms as' shuize abdominal firmness' as the waiting for the three seasons of cold solar terms.