Little is known about solar terms in beginning of winter.

The knowledge of solar terms in beginning of winter includes historical origins, seasonal division methods and meteorological changes.

1, historical origin

As for the division time of the four seasons, China traditionally takes "Li Si" (beginning of spring, Changchun, beginning of autumn and beginning of winter) among the "24 solar terms" as the beginning of the four seasons, and "Bi Fen" (vernal equinox and autumnal equinox) and "Two Fingers" (summer solstice and winter solstice) as the midpoint of the four seasons, which has obvious astronomical significance. The change throughout the year is a continuous process.

It is also a process of yin-yang transformation, from one side to the other, quantitative change produces qualitative change. In this gradual process, beginning of spring, Changxia, beginning of autumn and beginning of winter, also known as "Sili", are the opening of the season and the turning point in the 24 solar terms.

2. Seasonal division method

The commonly used methods of season division mainly include "solar terms method" and "temperature method". China traditionally takes the "beginning of winter" with "twenty-four solar terms" as the beginning of winter; The winter divided by the "solar terms law" means that everything enters a state of recuperation. According to the "temperature method", winter begins when the average temperature of the day falls steadily below 10℃ for five consecutive days. Winter divided by temperature means cold weather.

3. Meteorological changes

In early winter, the sun has reached the longitude of 225 degrees, the sunshine time will continue to be shortened, the height of the sun will continue to decrease at noon, and the amount of solar radiation obtained by the northern hemisphere will be less and less, but there is still some energy due to the heat stored on the surface in the second half of this year. Because there is still "accumulated heat" on the surface, it is usually not very cold in early winter, and the real cold is after the winter solstice.

Due to the large span between north and south in China and the great climate difference between north and south, the winter with this climatic significance is obviously late for some parts of China. After winter, the climate changes from dry autumn to rainy and cold winter.

Beginning of winter solar terms custom:

1, sacrifice

Beginning of winter is one of the "four seasons and eight festivals" in ancient society, and it is a very important festival. In some parts of China, there are customs such as offering sacrifices to ancestors, holding banquets to predict the elderly, and offering sacrifices to ancestors with the best seasonal products, so as to fulfill the obligations and responsibilities of future generations and pray for a good year from God.

Step 2 Eat jiaozi

In northern China, there is a custom of eating jiaozi in beginning of winter. In order to improve your life in early winter, jiaozi is delicious, but it is not in jiaozi. In the north, it is the custom to eat jiaozi in winter, because jiaozi looks like ears. People think that if you eat them, your ears won't catch a cold in winter. In addition, jiaozi's homonym "jiaozi" means that winter begins at the turn of autumn and winter.

Step 3 brew yellow rice wine

It is a traditional Shaoxing wine-making custom to start brewing yellow wine in beginning of winter that day. Winter is the most suitable season for wine fermentation, because the low water cooling temperature can also make wine form a good flavor in the process of low temperature and long-term fermentation. Therefore, Shaoxing people regard beginning of winter to beginning of spring in the second year as the most suitable time to brew yellow rice wine, which is called "winter brewing" to pray for happiness.

Refer to the above content: Baidu Encyclopedia-beginning of winter