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 rural areas are still using the lunar calendar. This lunar calendar is a combination of yin and yang, with the moon cycle in the month and the solar cycle in the 24 solar terms. It should be said that it is the solar calendar. In the first half of the year, it is related to the solar calendar. In the second half, it is called the lunar calendar, and solar terms are mixed with the lunar calendar. 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 centers in China have 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. Because of China's vast territory and changeable terrain, the 24 solar terms are only a reference for many areas.
The 24 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 vernal equinox (longitude zero, at this moment the sun shines vertically on the equator), every forward 15 degrees is a solar term; After a week's operation, I returned to vernal equinox, which is a tropical year, which is 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 is always between February 3rd and 5th in the solar calendar. However, in the lunar calendar, the date of the solar term is not easy to determine. Take beginning of spring as an example, it can be on1February 15 of the previous year's lunar calendar and on 15 of the first month at the latest.
The calculation formula of the date of the winter solstice (East Eight Districts): (YD+C)-Interpretation of the L formula: Y= two digits after the number of years, D=0.2422, L= leap years, 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 = 21,1February 21solstice. Exception: the calculation results of 19 18 and 2002 1 year are minus1day.
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