Zhang Zhongjing, a medical sage, saw that people's ears were damaged by freezing in the cold, so he cooked bread with herbs to dispel the cold and made Joule soup to treat people's ears. Winter solstice is the first of the 24 solar terms, which is called "sub-year". During the Yin and Zhou Dynasties, the day before winter ended the year.
In ancient times, the winter solstice was a very important festival. It is said that the winter solstice was as big as a year. The imperial court and the people have always attached great importance to it, and there have been sacrificial activities since the Zhou Dynasty.
On the solstice after winter, the weather is mainly cold, so people often keep warm and nourish yang to resist cold evil. Jiaozi is a delicious food with comprehensive nutrition and easy digestion and absorption. You can stuff mutton, cabbage, green onions, leeks and radishes. These dishes are warm and have a certain warming effect on the human body.
The winter solstice is the shortest day of the year in the northern hemisphere. After the winter solstice, the direct point of the sun gradually moved northward, the days in the northern hemisphere began to get longer and the height of the sun gradually increased at noon.
Therefore, there is a saying, "Eating noodles on the solstice in winter will make the day longer." From winter to the future, although the solar altitude angle gradually increases, it is a slow recovery process, and the heat lost every day is still greater than the heat received, showing a situation of "making ends meet".