Twenty-four solar terms schedule

Spring rain surprises spring, clear valley, midsummer, midsummer heat, autumn dew, autumn frost, winter snow and winter slight cold.

The difference between the two festivals is at most one or two days per month. It's six twenty-one in the first half of the year and eight twenty-three in the second half.

This is the twenty-four solar terms summed up by the working people in ancient China through continuous practice. At first, they just noticed that the position of the sun was different in different climates at the same time, so they set up a bamboo pole on the ground and observed the change of the shadow length of the bamboo pole. The shortest day of bamboo shadow at noon is the summer solstice, while the longest day of bamboo shadow is the winter solstice. Gradually, they found that one day in spring and autumn was equal to the length of day and night, so they decided to call it the vernal equinox and autumnal equinox, which was too long for production. Other solar terms have also been formulated. Beginning of spring, Rain, Long Summer, Slight Summer, beginning of autumn, Early Summer, Millennium and Early Frost were formulated in the Qin Dynasty. By the Han dynasty, all the 24 solar terms were determined, exactly the same as our current 24 solar terms.

As early as1February, in Lv's Spring and Autumn Annals, eight solar terms were established: beginning of spring, Spring Equinox, Long Summer, Summer Solstice, beginning of autumn, Autumn Equinox, beginning of winter and Winter Solstice. These are the eight most important solar terms in the twenty-four solar terms, which clearly and accurately mark the process of four seasons' transformation.

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, 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.

Twenty-four solar terms reflect the apparent movement of the sun in one year, so the dates of solar terms are 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.