What does it mean to blow six tubes of dynamic fly ash?

This means that after the winter solstice, the extreme yin ends and the yang begins to rise. The ancients were very clever. They borrowed six pipes with fixed pitch and filled them with enamel ash. When the first pipe was opened on the day of winter solstice, the sun's spirit began to rise, and the sun's spirit washed up the enamel ash, thus knowing the solar terms.

In winter solstice, although the sun is low and the days are short, the temperature in winter solstice is not the lowest in meteorology. In fact, because there is still "accumulated heat" on the surface, it is usually not very cold before the winter solstice, and the real cold is after the winter solstice.

Because of the huge climate difference in China, this climatic winter is obviously late for most parts of China. The winter solstice marks the beginning of the cold season, and people begin to count to nine to calculate the cold weather (folk proverb: "The summer solstice is the third watch, and the winter solstice is the ninth watch").

The winter solstice is the 22nd of the 24 solar terms.

The solar calendar reaches 270, and every year the solar calendar is 65438+February 2 1-23. The solstice in winter is the extreme point of direct sunlight spreading to the south. From winter to the sun, the sun shines directly on the tropic of Capricorn, and the sun is most inclined to the northern hemisphere, and the elevation angle of the sun is the smallest. In all parts of the northern hemisphere, the days are the shortest and the nights are the longest.

The solstice in winter is also the turning point of direct sunlight returning to the north. After this day, it went back, and the direct sunlight began to move northward from the Tropic of Capricorn (23 26' s), and the sunlight in the northern hemisphere (China is located in the northern hemisphere) increased day by day.