How to calculate the solar terms of a year?

1, 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 (leap year 13) are put together to call a year.

The lunar calendar is characterized by the meaning of the month, so there is a full moon on the 15th. On the contrary, the year is meaningless (not referring to culture), just a collection of months.

3. The solar calendar is defined according to the seasons, that is, the earth revolves around the sun for one year, and then this 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.

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

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

7. 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, and the solar calendar was skillfully integrated into the solar calendar, which greatly facilitated farming.

8. The time when the sun runs along the longitude of the Yellow River from zero degrees 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, great heat, intense heat, autumnal 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.

9. 24 solar terms reflects the annual apparent movement of the sun, so the date of solar terms is basically fixed in the current Gregorian calendar, with the first half of the year being 6 days and 2 1, and the second half being 8 days and 23 days, with a difference of 1 ~ 2 days.