Why is the winter solstice this year 12.5438+0 instead of 12.22?

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.

Extended data

The solstice in winter is as big as a year.

Agricultural production is closely related to the rhythm of nature. "Twenty-four solar terms" is the product of ancient farming civilization, which not only plays a guiding role in agricultural production, but also affects ancient people's basic necessities of life and even cultural concepts. In the twenty-four solar terms, beginning of spring is the starting point of the "Yin and Yang" qi Yang Qi, and a new cycle begins in beginning of spring.

The solstice in winter is the starting point of the sun's return, marking the rebirth of the sun and the new cycle of the sun's round-trip movement. In the four seasons and eight festivals, the winter solstice symbolizing the rebirth of the sun is as important as beginning of spring symbolizing the rising of the yang. Therefore, the ancients also regarded the solstice in winter as a "good day"