According to the ancient time-keeping method in China, the hours from 1 1 in the evening to 1/in the morning of the next day are sub-hours. "Zi" is "Zi Shi", which is homophonic with "Jiao", meaning "happy reunion" and "good luck". The "intersection" is the moment when the new year and the old year intersect.
The story of the origin of eating jiaozi on the winter solstice.
Jiaozi, formerly known as "Jiao Er", is said to have been first invented by Zhang Zhongjing, a medical sage in China. His story of "Quhan Jiaoer Decoction" has spread among the people to this day.
According to legend, when Zhang Zhongjing was the prefect of Changsha, he often cured diseases for the people. One year, when the local plague prevailed, he built a cauldron at the entrance of Yamen, giving up medicine to save people, which won the love of Changsha people. After Zhang Zhongjing retired from Changsha, he just happened to catch up with the winter solstice and walked to the bank of the Baihe River in his hometown. He saw many poor people suffering from hunger and cold, and their ears were frozen.
It turned out that typhoid fever was prevalent at that time, and many people died. He was very upset and determined to treat them.