The winter solstice is an important solar term in China's 24 solar terms, marking the official beginning of winter. The cause of the winter solstice can be traced back to ancient times, according to the "Seventy-two Candidate Explanations of the Lunar Order": "The winter solstice, in the middle of November. The ultimate hidden qi is here and far. The winter solstice means that the sun reaches 270 degrees of ecliptic longitude, which is the extreme of winter. 
The winter solstice usually falls between December 21 and 23 of each year in the Gregorian calendar. In ancient times, the winter solstice was an important festival where various celebrations were held to pray for a good harvest and peace in the coming year.
The winter solstice usually falls between December 21 and 23 of each year in the Gregorian calendar. In ancient times, the winter solstice was an important festival where various celebrations were held to pray for a good harvest and peace in the coming year.
Among the related customs, eating tangyuan is an important activity. Tangyuan is a spherical food made from glutinous rice and is usually eaten after being cooked on the day of the winter solstice. In addition, drinking mutton soup is also one of the customs of the winter solstice. In the northern region, people will eat dumplings, buns and other foods on the day of the winter solstice.
In addition to the food customs, there are also activities related to the winter solstice. For example, people hang red peppers and green carrots in their homes to welcome the arrival of winter. In addition, people will also do some exercises and sports on the day of the winter solstice, such as tai chi, running, etc., to enhance the body's immunity.