What does the solstice mean in winter?

The arrival of the winter solstice means that winter is officially coming.

The ancients said this about the winter solstice: As soon as the cathode arrived, the yang began to grow, the sun went south, the day was short and the shadow was long, so it was called "the winter solstice". After the winter solstice, the climate everywhere has entered the coldest stage, which is often called "entering the ninth". In China, there is a folk saying that "it's cold in March, and it's dog days".

The winter solstice is the year with the shortest day and the longest night in the northern hemisphere. According to modern astronomical science, on the solstice in winter, the sun shines directly on the tropic of Capricorn, and the sun is most inclined to the northern hemisphere. The northern hemisphere has the shortest day and the longest night. After the winter solstice, the sun gradually moves northward, and the days will be longer day by day.

Winter solstice is an important solar term in the 24 solar terms of the lunar calendar. There is a folk saying that winter solstice is as big as a year. From the winter solstice, it entered the "cold weather for several nine days", and every nine days thereafter, it was called a "nine". After 8 1 day of the "nine", it was called a "nine". On the sunny day of September 9th, it will be the season of spring.

Meteorological changes:

From winter to the future, although the solar altitude angle gradually increases, it is a slow recovery process, and the heat lost every day is still greater than the heat received, showing a situation of "making ends meet". On the day of "March 9 and April 9", the accumulated heat is the least, the temperature is the lowest, and the weather is getting colder and colder.

China has a vast territory, and the climate and landforms vary greatly from place to place. Although the days from winter solstice are short, the temperature from winter solstice is not the lowest; It won't be very cold before the winter solstice, because there is still "accumulated heat" on the surface, and the real cold winter is after the winter solstice. Due to the disparity of climate in different parts of China, this astronomical climate feature is obviously late for most parts of China.