Dahan is the last solar term in the twenty-four solar terms. Every year around January 20, when the sun reaches 300° ecliptic longitude, it is called "Dahan". DaChan means that the weather is extremely cold. "Tong Kao Tianshi" quoted "Three Rites and Righteousness": "The big cold is the middle, and the upper shape is the small cold, so it is called the big... The reverse of the cold, so it is called the big cold." At this time, the cold wave is heading south. Frequent, it is a cold period of the year in most parts of China, with strong winds, low temperature, and the snow does not melt on the ground, showing a severe cold scene of ice and snow, and the sky is freezing.
beginning of winter frost
There is a folk saying "small cold and big cold, no wind and cold". The proverb "Small cold and big cold, cold into a ball" indicates that the Great Cold solar term is also a cold period of the year. The so-called "hot in three volts, cold in four or nine days", the coldest period of the year is "three nine days, four nine days". Counting nine has been counted until "Nine Nine" eighty-one days, "nine peach blossoms are blooming", at this time the cold is over and the weather is warm.
tail tooth festival
According to Chinese customs, especially in rural areas, during the Great Cold Festival, people are busy removing the old and making the new, pickling the New Year dishes, and preparing the New Year's goods. There are many important folk customs and festivals during the period from the Great Cold to the Beginning of Spring. Such as tail tooth festival, sacrificial stove and New Year's Eve, sometimes even the Spring Festival, the biggest festival in China, is also in this solar term. The Great Cold solar term is full of joy and joy, and it is a cheerful and relaxed solar term. The tail tooth originates from the custom of worshipping the land duke as "tooth".