19293949 What is the solar term?

Jiujiu is a traditional solar term in China, which begins after the winter solstice every year. Count nine from winter to day, count nine every nine days, and so on. The total is * * * 998 1 day, which is considered as the nine-season knot. ...

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As the saying goes, "it's hot in three days, cold in four or nine days", and the coldest period in a year is "three or nine days".