What does the first "winter" of "winter snow, winter slight cold" mean in the solar term Song Dynasty?

The first "winter" in solar terms, Winter Snow and Winter Slight Cold, refers to the beginning of winter solar terms. Beginning of winter is one of the 24 solar terms in the lunar calendar and one of the traditional festivals in China. The time point is between165438+1October 7-8 every year. After beginning of winter, the sunshine time will continue to shorten, and the noon sun height will continue to decrease. China folks regard beginning of winter as the beginning of winter.

Twenty-four solar terms: Spring rains shake the spring and clear the valley, and summer is full of heat. Autumn dew, autumn frost, little snow in winter and cold in winter. Twenty-four solar term song is a small poem compiled for the convenience of remembering the twenty-four solar terms in the ancient calendar of China, which has been passed down to this day. Solar terms refer to the twenty-four solar terms and climate, which is a supplementary calendar formulated by China in ancient times to guide farming, and is the crystallization of long-term experience and wisdom of working people in ancient China.

Beginning of winter is the nineteenth of the twenty-four solar terms in the lunar calendar. Astronomy regards "beginning of winter" as beginning of winter. According to the climatic zoning, China will postpone winter for about 20 days. In early winter, the sun has reached 225 degrees, and the amount of solar radiation in the northern hemisphere is getting less and less. However, due to the storage of heat and some energy on the surface in the second half of this year, it is generally not too cold, but the temperature is gradually decreasing. When there is no wind on a sunny day, sunny, warm and comfortable "Xiaoyangchun" weather often appears in October.