Is the winter solstice a fixed day? Brief introduction of winter solstice.

The winter solstice is the most important of the 24 solar terms. According to the Gregorian calendar, the winter solstice is on February 22-23 every year, 12. On this day, the sun moves to the longitude of 270 degrees, with the southernmost latitude. The sun shines directly on the Tropic of Capricorn, with the shortest day and the longest night in the northern hemisphere (in the Arctic Circle, it is night all the time).

On the day of winter solstice, the height of the sun at noon in the northern hemisphere is also the lowest. For example, in Beijing, the height of the sun is only 26 42'. Because the shadow at noon on this day is the longest, it is also called "growing to the sun". China attached great importance to the winter solstice in ancient times, and stipulated that the same month as the winter solstice was the "sub-month", which was the first branch of the twelve solar terms. Therefore, the winter solstice is still a traditional festival, commonly known as "Winter Festival" and "Dragon Solstice Festival".