How many years does the solar calendar from winter solstice change?

In the solar calendar, the relative dates of winter solstice are almost the same. In the northern hemisphere, it is generally between 65438+February 2 1 and 65438+February 23, but it fluctuates in these three days every two or three years, and it is almost impossible to be on the same day for four consecutive years.

Pointing to the bucket, the longitude of the sun is 270, which is the solstice in winter. The first month is the first month, November is the second month, and the winter solstice is the 22nd of the 24 solar terms. The winter solstice usually falls on 65438+February 2 1 or 65438+February 22 in the Gregorian calendar.

For example, the specific time of winter solstice in 2020: 65438+February 2 1, 18: 02.

Extended data:

The ancients said that winter solstice: Yin arrives, Yang is the spirit, the day is south, the day is short, and the shadow is long, so it is called "winter solstice". It can be seen that the days are getting longer and longer after the winter solstice, and from the astronomical point of view, the sun shines directly on the tropic of Capricorn during the winter solstice, which is the shortest day and the longest night in all parts of the northern hemisphere. After the winter solstice, the sun began to go north from the tropic of Capricorn.

After the solstice of winter, winter begins to get very cold. At this time, the average temperature in most parts of northern China is generally below 0℃, while the average temperature in most parts of southern China is only about 6℃ to 8℃. However, this is not the coldest time, and it will gradually get colder in the future, and more and more heat will be lost on the earth's surface. The period of slight cold and severe cold is the coldest time in the whole winter. At this time, except for Guangdong and Hainan, which are warmer in the south, the rustle of winter is generally felt in other parts of China.