What does the twenty-four solar terms mean?

Twenty-four solar terms refer to: 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, white dew, autumnal equinox, cold dew, early frost, beginning of winter, light snow and heavy snow.

There is a folk song "Twenty-four solar term song", which can help you remember:

The spring rain shakes the spring and clears the valley, and the summer is full of mountains and summers.

Autumn dew, autumn frost, little snow in winter and cold in winter.

The specific meaning of the twenty-four solar terms:

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). Depending on the sun starting from the vernal equinox (longitude zero, at this moment the sun shines vertically on the equator), every advance of 15 degrees is a solar term; After running for a week, it returns to the vernal equinox, which is a tropic year with 360 degrees, so it is divided into 24 solar terms precipitation phenomena, indicating the time and intensity of rainfall and snowfall; The three solar terms, White Dew, Cold Dew and First Frost, on the surface reflect the phenomenon of condensation and condensation of water vapor, 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.

Twenty-four solar terms can reflect the changes of seasons, guide agricultural activities and affect the food, clothing, housing and transportation of thousands of families. The twenty-four solar terms are determined according to the position of the sun on the ecliptic (that is, the orbit of the earth around the sun). April 20 14, the Ministry of Culture of China officially began to declare the "24 solar terms" to UNESCO's List of Intangible Cultural Heritage of Humanity.

The role of the twenty-four solar terms:

Twenty-four solar terms objectively reflect the changes of seasons and climate, and are the signs of phenology and seasonal order in China. Its formation and development are closely related to agricultural production in China, which can effectively guide agricultural production.