Why is the solar term from winter solstice called "winter solstice"?

The position of the sun on the earth during the winter solstice is the tropic of Capricorn. The direct point of the sun from the winter solstice is on the tropic of Capricorn. When the earth revolves around the winter solstice, the direct point of the sun is on the tropic of Capricorn. When the earth turns to the winter solstice, the sun shines directly on the tropic of Capricorn. At this time, the days in the southern hemisphere are longer than the nights, and the South Pole is extremely bright. During the summer solstice, the positive direction of the sun is on the tropic of cancer. At the vernal equinox and autumnal equinox, the direct point of the sun is on the equator. The winter solstice is located in the Tropic of Cancer in the southern hemisphere. After the winter solstice, the sun began to move northward to the equator and then to the Tropic of Cancer.

Characteristics of winter solstice:

The winter solstice is the 22nd solar term in the "24 solar terms", and the solar calendar reaches 270 degrees. Every year, the festival is held on 65438+February 2 1-23 in the Gregorian calendar. The solstice in winter is the extreme point of direct sunlight spreading to the south. On the solstice in winter, the sun shines directly on the Tropic of Capricorn, which is the most inclined to the northern hemisphere and the solar altitude angle is the smallest. In all parts of the northern hemisphere, the days are the shortest and the nights are the longest.

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 great difference in climate in different parts of 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 nine to calculate the cold days.