Why is the winter solstice in 2020 65438+February 2 1?
Time calculation of winter solstice: the date calculation formula of winter solstice (East Eight Districts): (yd+c)-Interpretation of L formula: Y= the last two digits of years, D=0.2422, L= leap year, 265438+c = 21.94 20th century =22.60. The date of winter solstice in 2020 = [20× 0.2422+2 1 .94]-[20/4] = 21,so the winter solstice is 65438+February 21. It should be noted that the specific solar term time from the winter solstice to the sun is exactly the same, no matter whether it is the level air method (used before 1645) or the constant air method (used since 1645). This is the only one of the 24 solar terms.
Whether the winter solstice is based on the lunar calendar or the solar calendar: the solar calendar (the new calendar) is determined according to the degree to which the sun reaches the yellow meridian. As early as more than 2,500 years ago in the Spring and Autumn Period, China had observed the sun with soil, and determined the winter solstice, which was the earliest of the 24 solar terms, and the time was between 65438+February 2 1 ~23 in the Gregorian calendar every year.
The origin of the winter solstice originated in the Han Dynasty, flourished in the Tang and Song Dynasties, and has continued to this day. Lu even said that winter is as big as a year, which shows that the ancients attached importance to winter. People think that the winter solstice is a natural transformation of yin and yang and a blessing from heaven. In the Han Dynasty, the winter solstice was regarded as the "Winter Festival", and the official celebration ceremony was called "Hedong", which was a routine festival. It is recorded in the Book of the Later Han Dynasty: "Around the winter solstice, gentlemen lived quietly, and officials refused to listen to politics, chose an auspicious day, and then saved trouble." So on this day, the court will have a holiday and rest, the army will be on standby, the border will be closed, and friends and relatives will give each other food.
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