Why is the winter solstice not calculated according to the lunar calendar?

There is no fixed time for the winter solstice. Generally, it is between 65438+February 2 1 and 65438+February 23. According to the new calendar, many festivals are counted according to the lunar calendar. Why is the winter solstice not calculated by the lunar calendar, but by the new calendar? How is the new calendar worked out? Then reveal the answer to everyone!

Why don't you calculate the winter solstice according to the lunar calendar? First of all, you must know the calendar of China. The official calendar is the solar calendar, and the lunar calendar is still used in rural areas. This lunar calendar is a combination of yin and yang, with a monthly cycle in the middle and a solar cycle in the twenty-four solar terms. It should be said that it is the solar calendar. The first half of the year is related to the solar calendar. The second half is called lunar calendar, and solar terms and lunar calendar are mixed together. Most people think that solar terms are related.

Twenty-four solar terms are the original cultural heritage of working people in China, which can reflect the changes of seasons, guide agricultural activities and affect the food, clothing, housing and transportation of thousands of households. Since 2000, the main political activity center in China has been concentrated in the Yellow River Basin, and the 24 solar terms have been established on the basis of the climate and phenology in this area. Due to the vast territory and changeable terrain of China, the 24 solar terms are only a reference for many regions.

The twenty-four solar terms are divided according to the position of the sun on the ecliptic (that is, the orbit of the earth around the sun). Depending on the sun starting from the vernal equinox (longitude zero, at this moment the sun shines vertically on the equator), every advance of 15 degrees is a solar term; After a week's operation, I returned to the vernal equinox, which is a tropical year with 360 degrees, so it is divided into 24 solar terms. The dates of solar terms are relatively fixed in the solar calendar. For example, beginning of spring in the solar calendar always falls between February 3rd and 5th. However, in the lunar calendar, the date of solar terms is not easy to determine. Take beginning of spring as an example. It can be the first day of the lunar calendar in the previous year, 65438+February 15, and the latest is the first month, 15.

Calculation formula of winter solstice time: (yd+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.

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