Why is the winter solstice 65438+February 22nd every year?

The winter solstice usually falls on the second day of Gregorian calendar 65438+February 2 1 or 65438+February 22. This is because the winter solstice is not fixed on a certain day, so it is called "live festival" like Qingming.

Calculation method of winter solstice:

Calculation formula of winter solstice date (East Zone 8):

(YD+C)-L

Interpretation of the formula:

Y= 2 digits after years, D=0.2422, L= leap years,

2 1 century C=2 1.94, 20th century =22.60.

For example:

Winter solstice date in 2088 = [88× 0.2422+21.94]-[88/4]

=43-22=2 1

65438+February 2 1 winter solstice.

Exception: the calculation results of years 19 18 and 202 1 decrease by 1 day.

It should be pointed out that:

No matter according to the leveling method (used before 1645) or the constant gas method (used since 1645), the specific node time of winter solstice is exactly the same. This is the only one of the 24 solar terms.

The winter solstice is the earliest of the 24 solar terms, and the time is between June 65438 and February 2 1-23 in the Gregorian calendar every year. The ancients believed that since the winter solstice, the days are getting longer and longer, the yang is rising, and the yang of heaven and earth is getting stronger and stronger, which represents the beginning of the next cycle. This is a good day.

Winter solstice (solar term): The ancients said that the winter solstice was called "winter solstice", because the cathode arrived, the sun began to grow, and the sun reached the south, with short days and long shadows.

Winter solstice, also known as "one-day birth", is an important solar term in the China lunar calendar and a traditional festival of the Chinese nation. The solstice in winter is commonly known as "number nine, winter festival", "long festival" and "sub-year" As early as more than 2,500 years ago in the Spring and Autumn Period, China had observed the sun with the earth and determined the winter solstice, which was the earliest of the 24 solar terms.

It is worth noting that around the winter solstice, the earth is located near the perihelion, and its running speed is slightly faster, resulting in that the time for the sun to directly shine in the southern hemisphere is about 8 days shorter than that in the northern hemisphere, so the winter in the northern hemisphere is slightly shorter than that in summer.