Why is the winter solstice written in the geography book 65438+February 22nd, and this year's winter solstice is 65438+February 2nd1?

The winter solstice usually falls on the Gregorian calendar 65438+February 2 1 or 65438+February 22. Because the winter solstice is not fixed on a certain day, it is called "live festival"

The formula for calculating the date of winter solstice (East Eighth District) is (y * d+c)-L. Interpretation of the formula: Y= the last two digits of the number of years, D=0.2422, L= the number of leap years, 2 1 century C=2 1.94, and 20th century = 22.

For example, the date of the winter solstice in 2088 = [88× 0.2422+2 1 .94]-[88/4] = 43-22 = 21,65438+February 21.

People also infer the future weather according to the arrival of the winter solstice and the weather on that day. As the saying goes, "the winter solstice is dark, and the new year's goods are rare; Winter is thin and the New Year is black. " This means that if there is no sun on the solstice in winter, the new year will be sunny. On the contrary, if the winter solstice clears up, there will be rain and snow in the New Year.