Related knowledge of the twenty-four solar terms

1 and 24 solar terms are: winter solstice, slight cold, severe cold, beginning of spring, rain, fright, vernal equinox, Qingming, Grain Rain, long summer, Xiaoman, Miscanthus, summer solstice, slight summer heat, great summer heat, beginning of autumn, early summer heat, Millennium, autumn equinox, cold dew, early frost, beginning of winter and light snow.

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).

3, depending on the sun from the vernal equinox (longitude zero, when the sun shines vertically on the equator), every forward 15 degrees is a solar term; After running for a week, it returned to the vernal equinox, which is a tropical year with a total temperature of 360 degrees. Therefore, it is divided into 24 solar terms precipitation phenomena, indicating the time and intensity of rainfall and snowfall.

4. The three solar terms, White Dew, Cold Dew and First Frost, on the surface reflect the phenomenon of water vapor condensation, but in essence reflect the process and degree of gradual temperature drop: when the temperature drops to a certain extent, water vapor condenses; The continuous drop in temperature not only increases condensation, but also gets colder and colder; When the temperature drops below zero degrees Celsius, water vapor condenses into frost.

The twenty-four solar terms are unique in the calendar used by our Chinese nation, which reflects the annual movement law of the sun and is used by people to guide farming, production and life. In ancient times when science and technology were underdeveloped, the 24 solar terms provided great guiding significance for people's production and life, and were the crystallization of the wisdom of the Chinese nation.