Which of the 24 solar terms represents the arrival of spring, the beginning of spring or the vernal equinox?

After beginning of spring, the temperature rose, and most parts of the country began a busy spring ploughing season. Beginning of spring solar terms began, westerly jet, the southern branch of East Asia, began to weaken, and the winter climate was coming to an end. However, the intensity and location of the northern branch of westerly jet remain basically the same, the Mongolian cold high and Aleutian low are still relatively strong, and gale cooling is still the prevailing main weather.

However, during the intermission under the influence of strong cold air, the frequency of southerly winds increases, accompanied by an obvious warming process.

On the vernal equinox, the sun shines almost directly on the equator of the earth, and the whole world is almost as long as day and night. After the vernal equinox, the direct point of the sun began to enter the northern hemisphere, and the days became longer and the nights became shorter in all parts of the northern hemisphere. The vernal equinox is an important solar term, which is not only of astronomical significance: the northern and southern hemispheres divide the day and night equally.

Climatically, there are also obvious characteristics. During the spring equinox, China has entered a beautiful spring scenery except the Qinghai-Tibet Plateau, Northeast China, Northwest China and North China. On the vast land, willows are green, Fei Ying grass grows, wheat jointing and rape blossoms are fragrant.

Twenty-four solar terms are formulated according to the position change of the sun on the ecliptic (that is, the orbit of the earth around the sun). 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. Formed in the Spring and Autumn Period and the Warring States Period. Huainanzi Astronomical Training published in the Western Han Dynasty completely recorded all the "twenty-four solar terms".

Second, the content

(1) Spring (February 4th, beginning of spring) Rain (Rain) Surprise (Sting) Spring (Equinox) Sunny (Qingming) Valley (Grain Rain) Day,

(2) Summer (May 5th, long summer) is full of (little man) awns, and summer (summer solstice) is connected with summer (little summer and big summer).

(3) Autumn (August 7th, beginning of autumn) dew (white dew) autumn (autumnal equinox) cold (cold dew) first frost (first frost),

(4) Snow (light snow) in winter (beginning of winter165438+1October 7th) and slight cold (slight cold and heavy cold) in winter (winter solstice).