What method is used to calculate the handover time of the 24 solar terms in the lunar calendar?

Many people don't know why the lunar calendar is different from the solar calendar. They only know that China uses the lunar calendar and the west uses the solar calendar.

The lunar calendar is defined according to the phase of the moon, that is, the moon revolves around the earth for one month, and then 12 months (13 leap year) are put together to call a year.

The lunar calendar is characterized by the moon, so there is a full moon on the fifteenth. On the contrary, the year is meaningless (not referring to culture), just a collection of months.

The solar calendar is defined according to the seasons, that is, the earth orbits the sun for one year, and then the year is divided into roughly equal 12 blocks, and each block is called a month.

The solar calendar is characterized by the meaning of years, so the seasons in each period are similar. On the contrary, the month is meaningless, just the average score of a year.

Therefore, both the lunar calendar and the solar calendar have their own defects, and they are still imperfect. Who do you think is more scientific?

In ancient China, I knew the astronomical knowledge of the solar calendar like the back of my hand, so I formulated the 24 solar terms into the corresponding revolutionary position of the earth (every 150 solar terms), so there was a phenomenon that solar terms could coincide with the solar calendar date, but not with the lunar calendar date. For some people, this is simply a manifestation of a serious lack of calendar knowledge.

In fact, China's old calendar is not a complete lunar calendar, and the technical term is "Yin and Yang calendar". The pure lunar calendar is one year every 12 months, so in a few years, January will be summer.

In order to change this pattern, China came up with the method of leap month. Once the lunar calendar date exceeds a certain season range, it will delay the leap month, so that it will not deviate too much. A fashionable word is "feedback".

Moreover, twenty-four solar terms were added to the old calendar, which skillfully integrated the solar calendar into the solar calendar, greatly facilitating farming.

The time when the sun runs along the longitude of the Yellow River from zero 15 degrees is called "a solar term". It runs 360 degrees every year, and * * * experiences 24 solar terms, twice a month. Among them, the first solar term of each month is "solar term", that is, beginning of spring, Jingzhe, Qingming, Changxia, Mangzhong, Xiaoshu, beginning of autumn, Bailu, Hanlu, beginning of winter, Heavy Snow, Xiaohan, etc. 12 solar terms; The second solar term of each month is "Zhongqi", that is, there are 12 solar terms such as rain, vernal equinox, Grain Rain, Xiaoman, summer solstice, summer heat, summer heat, autumn equinox, first frost, light snow, winter solstice and great cold. "Solar term" and "neutral qi" appear alternately, each lasting 15 days. Now people have called "solar terms" and "neutral gas" solar terms.

The twenty-four solar terms reflect the annual apparent movement of the sun, so in the current Gregorian calendar, the dates of the solar terms are basically fixed. The first half of the year is on the 6th and 2nd1,and the second half is on the 8th and 23rd, with a difference of 1 ~ 2 days.

References:

. yahoo.com/question/？ qid= 14070 12505606