When is the solstice in the winter of 2023?

The winter solstice in 2023 is 1 1: 27: 09.

After the winter solstice, although the height angle of the sun gradually increases, it is a slow recovery process. The heat lost every day is still greater than the heat received, showing a situation of "making ends meet". On the third and fourth days, 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. The real winter is after the winter solstice. Because of the great climate difference in China, this astronomical climate feature is obviously late for most parts of China; After the winter solstice, the climate in all parts of China will enter a coldest stage, which is often called "ninth year cold" and "ninth year cold".

Historical origin

China's astrological culture has a long history and is profound. The twenty-four solar terms were originally formulated on the basis of changing stars. In different seasons and at different times, the Big Dipper will point in different directions, that is, "bucket handle points to the East, and the world is spring; Guide to barrel handle, it's summer in the world; Bucket handle refers to the west, and the world is autumn; The barrel handle refers to the north, and it is winter all over the world. "Twenty-four solar terms" is the product of ancient farming civilization, which is related to the time of dry farming and gossip and has a long history.

During the period of Emperor Wu of the Western Han Dynasty, the "Twenty-four solar terms" were absorbed into the taichu calendar as a calendar supplement to guide the agriculture in the northern Central Plains, and the "Twenty-four solar terms" were measured in the Yellow River basin by Tugui's solar shadow measurement method. The current "24 solar terms" are determined according to the position of the sun on the ecliptic, that is, on a 360-degree circle "ecliptic" (the apparent path of the sun on the celestial sphere for one year), there is a vernal equinox.

In the process of inheritance and development, the 24 solar terms have been incorporated into the lunar calendar and become an important part of the lunar calendar.