Why do you eat jiaozi on the solstice in winter?

In memory of the benefactor, people eat jiaozi every year on the day when Zhang Zhongjing cooks soup. It happened to be the solstice of winter. The winter solstice is the year with the shortest day and the longest night in the northern hemisphere. After the solstice in winter, the days will get longer day by day. The ancients said this about the winter solstice: As soon as the cathode arrived, the yang began to grow, the sun went south, the day was short and the shadow was long, so it was called "the winter solstice".

After the winter solstice, the climate everywhere has entered the coldest stage, which is often called "entering the ninth". In China, there is a folk saying that "it's cold in March, and it's dog days".

In ancient China, people attached great importance to the winter solstice and thought it was a grand festival. There is a saying that the winter solstice is as big as a year, and there is a custom to celebrate it. On the solstice of winter, the monarch does not ask about state affairs. They will listen to music for five days, have a holiday and rest in the imperial court, the army will be on standby, the frontier fortress will be closed, they will go on business trips, relatives and friends will send meals to each other, visit each other and have a "quiet" holiday happily. The Book of Jin records: "On the winter solstice of Wei and Jin Dynasties, people from all over the world celebrated ... its appearance was not as good as that of Zheng Dan."