What is the significance of the ancient 24 solar terms now?

In modern times, for many rural areas, the 24 solar terms are still very important to guide agricultural production. For example, in some winter wheat producing areas, "Don't panic when the cold dew arrives at the first frost, and relax when the first frost arrives in beginning of winter" is still an important guiding principle. I'm afraid it really doesn't mean much to the city. From the literal meaning of the twenty-four solar terms: beginning of spring, Changxia, beginning of autumn and beginning of winter-respectively represent the beginning of the four seasons. "Stand" means to start. The Gregorian calendar is generally around February 4th, May 5th, August 7th and165438+1October 7th every year. Solstice in summer and Solstice in winter-this means that summer and winter have arrived. "To" means to arrive. Summer solstice and winter solstice are generally on June 2 1 day and February 22 12 of the Gregorian calendar every year. Autumnal equinox, autumnal equinox-means that day and night are equal in length. "Divide" is equal share. These two solar terms are generally around March 20 and September 23 of the Gregorian calendar every year. Rain-indicates that the precipitation begins and the rainfall gradually increases. It rains around February 18 in Gregorian calendar every year. Sting-the sudden movement of spring thunder woke the hibernating animals in the soil. At this time, the temperature rose rapidly, and the spring thunder gradually sprouted. Every year around March 5 of the Gregorian calendar is a shock. Qingming-includes the meaning of sunny weather, fresh air, gradually warming climate and lush vegetation. The Gregorian calendar is Qingming around April 5 every year. Grain Rain —— The increase of rainfall is very beneficial to the growth of cereal crops. Grain Rain is around April 20th of the Gregorian calendar every year. Xiaoman-refers to the summer crops with full seeds, but not yet mature, just small and not yet full. Every year on May 2 1 day of the Gregorian calendar, it is full. Crops with awns, such as awn seed wheat, mature and summer sowing begins. Around June 5 every year, it is a mango. Hot in summer, hot in summer, hot in summer-hot in summer means hot. The heat is not the hottest time, but the heat is the hottest season, and the heat is the day when summer is coming to an end. They are around July 7, July 23 and August 23 of the Gregorian calendar every year. White dew-the temperature began to drop, the weather turned cold, and there was dew on the vegetation in the morning. The Millennium is around September 7 of the Gregorian calendar every year. Cold dew-the temperature drops, there is condensation in the air, and there is a chill gradually. This day is usually on June 8 10 every year. First frost-it's getting colder and colder, and it's frosting. The first frost usually occurs on the 23rd day of the Gregorian calendar 10 year 10. Light snow, heavy snow-it's starting to snow, with small and large indicating the degree of snowfall. Light snow falls on Gregorian calendar165438+1October 22nd, and heavy snow falls around 65438+February 7th. Slight cold, severe cold-the weather is getting colder and colder. Slight cold is not the coldest, but severe cold is the coldest time of the year. The Gregorian calendar 65438+1October 5th and 20th are mild and severe cold. Why are there 24 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 a week's operation, I returned to the vernal equinox, which is a tropical year with 360 degrees, so it is divided into 24 solar terms.