In northern China, there is a custom of eating jiaozi in beginning of winter. In early winter, you can improve your life, but it is not as delicious as jiaozi. In the north, the rule in beginning of winter is to eat jiaozi, because jiaozi looks like ears. People think that if you eat them, your ears will not be frozen in winter. In addition, jiaozi's homonym "cross" means that beginning of winter is the turn of autumn and winter.

Beginning of winter means that everything begins to enter a state of recuperation. Wu Cheng, a scholar in Yuan Dynasty, edited Twenty-four Solar Terms. He divided the twenty-four solar terms of a year into "seventy-two periods", and each solar term was divided into three periods. The three periods in beginning of winter are: "The water begins to freeze, the ground begins to freeze, and the water enters the flood, which is a mirage." Explain that at this time, the water has turned into ice and the land has begun to freeze. The pheasant in the flood refers to the pheasant and other big birds, and the pheasant is a giant clam.

Seasonal division

1, solar terms method

The traditional division of the four seasons in China is based on the "Li Si" in the 24 solar terms, starting from "beginning of winter" in winter and ending before the next "beginning of spring". In winter, which means "everything is finally collected", beginning of winter means that life begins to be closed and everything enters a state of recuperation.

2. Temperature method

When the average temperature (the average temperature for five consecutive days) is lower than 10℃, winter begins; When the average temperature is higher than 22℃, summer begins. The period when the average temperature is 10-22℃ is spring or autumn. According to the four seasons divided by the temperature method, winter begins when the daily average temperature drops below 10℃ for five consecutive days and ends when the daily average temperature rises above 10℃ for five consecutive days. The winter divided by temperature method means that the temperature drops steadily below 10℃, indicating that the weather is cold.