The winter solstice means that the cold winter is coming. At the winter solstice, the solar longitude is 270. On the winter solstice, the sun shines almost directly on the Tropic of Capricorn, and our northern hemisphere has the shortest day and the longest night, and it has begun to enter several cold days. Astronomy stipulates that this day is the beginning of winter in the northern hemisphere. After the winter solstice, the direct sunlight gradually moved northward, and the days in the northern hemisphere gradually became longer. As the proverb goes, eating noodles on the winter solstice makes a day grow longer.

The winter solstice is a very important solar term and a traditional festival in the Chinese lunar calendar, and there are still many places where the custom of the winter solstice festival has been held. The winter solstice is commonly known as the winter festival, the long solstice festival, and the sub-year-old. As early as the Spring and Autumn Period more than 2,500 years ago, our country had determined the winter solstice by observing the sun with Tugui, which was the earliest one of the 24 solar terms. The time is between the Gregorian calendar1February 22 or 23 every year.

After the winter solstice, the climate in all parts of China will enter a coldest stage, which is often said to be cold in September and September. The so-called number nine means that from the date of the winter solstice, nine days is a unit, which is called nine. After nine nines, it is exactly 81 days, which means nine or nine. Count from nine to nine, and the cold winter will turn into warm spring. The ancients believed that the winter solstice was the key solar term for the transformation of yin and yang.

Nine is the largest yang number in numbers. Constantly counting 19, 29, etc. means that the yin in winter is gradually reduced, and the yang is gradually picked up, until it is tired for nine times. From the meteorological point of view, there will be a cold wave every nine days, and it often happens in the last day or two of the previous nine; Psychologically speaking, nine and long are homophonic, meaning that winter is long, and I hope that spring will come early.