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Solstice is a traditional festival in China and one of the 24 solar terms. On the solstice of winter, there is a custom of eating glutinous rice balls in the south and jiaozi in the north. So, is the solstice in winter the coldest day? What is the earliest origin of the winter solstice? Next, let's take a look at this issue of almanac!

Is the solstice in winter the coldest day? When it is not the winter solstice, the earth is the perihelion and the farthest point of the sun's southward movement. On the winter solstice, the sun in the northern hemisphere has the smallest height and the shortest day, but the winter solstice is not the coldest day. Because when the direct point of the sun moves to the southern hemisphere, the temperature in the northern hemisphere begins to drop a little, the heat dissipation continues to be almost unchanged, and the weather will get colder and colder. Therefore, although the solar radiation energy is the lowest in winter solstice, the ground, especially the water body, can store huge energy as a buffer medium, so the temperature change needs an accumulation process. The cooling in the northern hemisphere is a continuous and slow process. On the solstice of winter, when the sun shines directly on the tropic of cancer, the temperature of the earth is still decreasing in that downward trend. The coldest solar terms in a year are around the slight cold solar terms and the great cold solar terms after half a month.

The winter solstice originated from which ancient traditional festival of the Chinese nation, whether it is a big festival or a small festival. Its origin is either from the astronomical phenomena or from the ancestors' choice of auspicious days to sacrifice to the gods and ancestors of heaven and earth to thank them for their kindness. Most festivals are "originated" by the legend of a person who is attached to the festival, but in fact, these sayings are far later than the birth of the festival and are constructed by future generations. In ancient times, there was a saying that "it is sunny in winter", that is to say, from the day of winter, the yang gradually began to rise. As the modern poem says: If winter comes, can spring be far behind? In ancient times, people wandering in a foreign land had to go home for the winter festival at this time. The so-called "going home at the end of the year". 055-79000 records: "Around the winter, gentlemen calmed down and officials refused to do anything. If they don't listen to the government, they will choose an auspicious day to save trouble. " In the folk, people visit each other and give each other delicious food.

The solstice in winter is still a traditional sacrifice day. It is said that after the Song Dynasty, the winter solstice gradually became a festival to worship ancestors and gods. In the Tang Dynasty, the solstice in winter was the day of offering sacrifices to heaven and ancestors. The emperor will hold a worship ceremony in the suburbs, and the people will worship their parents and elders. During the Ming and Qing Dynasties, the emperor held a ceremony to worship heaven, which was called "Winter to Sun Suburb Day". During this period, there are also folk customs such as ancestor worship and family banquets. Therefore, the winter of solstice is called "off-year". Taking the winter solstice as a holiday originated in the Han Dynasty, flourished in the Tang and Song Dynasties, and has been passed down to this day. The first month of the week calendar is 1 1 month of the summer calendar. Therefore, the first month of the Zhou Dynasty is equal to November in the solar calendar today, so there is no difference between New Year greetings and winter holidays. It was not until Emperor Wu of the Han Dynasty adopted the summer calendar that the first month was separated from the solstice in winter. It can also be said that the simple "Winter Solstice Festival" began in the Han Dynasty, which was very popular in the Tang and Song Dynasties and has been passed down to this day.