When was the ancient winter solstice solar term?

Winter solstice is a very important solar term in China lunar calendar, and it is also a traditional festival of the Chinese nation. The winter solstice is usually called "Winter Festival", "Dragon Solstice Festival" and "Asian Year". As early as 2500 years ago, during the Spring and Autumn Period, China observed the sun with the earth, and determined the winter solstice, which was the earliest of the 24 solar terms. The time of year is marked in the solar calendar. In most parts of northern China, it is also the custom to eat jiaozi and jiaozi on this day. There is a proverb: When winter solstice comes, we will eat jiaozi, and there are poems and films about this solar term.

The winter solstice is also called the winter festival. According to the traditional Chinese calendar, five days are the first class, three days are one day or one breath, and a year is divided into twelve days and twelve gases, which are collectively called twenty-four solar terms. This is the solar term used in the study of choosing a day.

The winter solstice is not fixed on a certain day, so it is called "live festival" like Qingming.

Calculation of winter solstice date [y * d+c]-Interpretation of L formula: Y= two digits after the number of years, D=0.2422, L= leap year, 2 1 century C=2 1.94, and 20th century =22.60. For example, the date of the winter solstice in 2088 = [88× 0.2422+2 1 .94]-[88/4] = 43-22 = 21,65438+February 21. Exception: the calculation results of years 19 18 and 202 1 decrease by 1 day.