Knowledge of the twenty-four solar terms

Twenty-four solar terms refer to twenty-four seasons and climates. Twenty-four solar terms, which originated in the Yellow River Basin in the Spring and Autumn Period, are supplementary calendars formulated by China to guide farming in ancient times. Tomb-Sweeping Day, which has just passed, is one of the 24 solar terms.

The twenty-four solar terms are based on the solar calendar, which reflects the annual apparent movement of the sun, so the date of the solar terms is basically fixed in the current Gregorian calendar.

The 24 solar terms are: beginning of spring, rain, sting, vernal equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Slight Summer, beginning of autumn, Early Summer, Millennium, Autumn Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold.

Beginning of spring, Changxia, beginning of autumn and beginning of winter, collectively called "Sili", indicate the beginning of the astronomical season. As far as climate is concerned, they are usually in the last season. The Gregorian calendar is usually around February 4th, May 5th and August 7th every year,165438+1October 7th.

The vernal equinox and autumn equinox are called "vernal equinox". At this time, the sun shines directly on the equator, and the whole world is equal in length of day and night. The vernal equinox is the beginning of spring in the northern hemisphere, usually around March 20 of the Gregorian calendar. From this day on, the days in the northern hemisphere are long and the nights are short. The autumnal equinox is the beginning of autumn in the northern hemisphere, usually around September 23 of the Gregorian calendar. From this day on, the days in the northern hemisphere are short and the nights are long.

The summer solstice and the winter solstice are collectively called the "second solstice". The summer solstice sun shines directly on the Tropic of Cancer, with the longest day and the shortest night in the northern hemisphere, indicating a hot season, generally around June 2 1 in the Gregorian calendar; In winter, the solstice sun shines directly on the tropic of Capricorn, with the shortest day and the longest night in the northern hemisphere, indicating the cold season, generally 65438+February 22 in Gregorian calendar.

Rain means that it begins to rain, and the rainfall gradually increases. Farming proverb: Spring warms bloom, but rain is busy to send fertilizer. Gregorian calendar February 18 or so.

The hibernating animals dormant in the soil began to wake up, and some parts of China entered the spring ploughing season. Agricultural proverb: those who are surprised plow the soil, and the vernal equinox makes the air flow. Around March 5 of Gregorian calendar.

Qingming, warm climate, budding vegetation, everything growing, farmers are busy sowing in spring. Around April 5 of Gregorian calendar.

Grain Rain, increase rainfall and nourish grain. Farming proverb: Before and after Grain Rain, we planted melons and beans. Gregorian calendar around April 20.

Xiaoman, summer crops are full of seeds, but not yet mature, so it is called Xiaoman. Gregorian calendar may 2 1 or so.

Crops with awns such as awn seeds and wheat have matured, and the middle and lower reaches of the Yangtze River have entered the "mildew rain" season. The Gregorian calendar is around June 5.

It was already hot before and after the summer heat, but it was not the hottest time. Around July 7th of Gregorian calendar.

Summer, the hottest solar term in a year, has the most rain. Agricultural proverb: Little summer, big summer, drowning mice. Gregorian calendar around July 23rd.

Summer is coming to an end, which is a turning point of temperature drop and a symbol of cool weather. Gregorian calendar around August 23rd.

White dew, cold weather, dew condensation on the ground. Around September 7th of Gregorian calendar.

Cold dew, dew increase, temperature decrease. Gregorian calendar 65438+1around October 8.

The first frost, the cold weather, and frost. Gregorian calendar 65438+1around October 23rd.

Light snow, the temperature dropped, the Yellow River basin began to snow, and the north entered the freezing season. Gregorian calendar165438+1around October 22nd.

Snow, snow, thousands of miles of glaciers, snow in Wan Li. Gregorian calendar 65438+around February 7.

Slight cold, beginning to enter the cold season, Gregorian calendar 1.5 or so.

Great cold, the weather is extremely cold, and it is the coldest season of the year before and after the Great Cold. Gregorian calendar 65438+1around October 20th.