Why is there a saying "September 9th in winter"?

There is a saying in the China lunar calendar called "Jiujiu", which is used to calculate the seasons. The calculation method is that from the solstice of winter (counting from the solstice of winter, indicating the beginning of cold), every nine days is a "nine", the first nine days are called "one nine", the last nine days are called "two nine", until nine nine nine, nineteen and ninety days.

The winter solstice is generally around 65438+February 23rd every year, and 90 days span the whole winter. During these three months, the weather gradually turned cold and then warmed up. The "99-99 Cold-dispelling Song" widely circulated in China, commonly known as "99 Song", vividly recorded the climate and phenological changes between the winter solstice and the vernal equinox, and also expressed some laws of farming activities.

The extended material "99 Songs" uses people's feeling of cold and phenological phenomena (that is, changes in animal and plant life caused by climate and environmental changes, such as willow germination, peach blossom, geese flying, etc.) to reflect the cold and warm weather. ). As early as the Southern and Northern Dynasties.

Compared with their descendants, the working people in ancient China, especially in the northern region, lacked the conditions to keep warm from the cold. The cold winter was regarded as a threat and punishment, which directly affected people's mood and even made them feel unusually long. At that time, in order to survive the long winter, the people of China invented the method of "counting nine" to pass the time, so as to alleviate the psychological crisis under the threat of winter. At that time, it was a carefree state to count nine around your family.

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