1, vernal equinox, one of the 24 solar terms, is the fourth solar term in spring. The fingers do not match, and the longitude of the sun reaches 0, which is celebrated on March 20-22 of the Gregorian calendar every year.

2. At the vernal equinox, the direct point of the sun is on the equator, and then the direct point of the sun continues to move northward, so the vernal equinox is also called the "rising equinox". In ancient times, it was also called "Japan-China", "Day and Night" and "Mid-spring Moon".

The vernal equinox is an important solar term, which is of great significance in astronomy: the northern and southern hemispheres are equally divided day and night. In climate, it also has obvious characteristics. Since then, the direct position of the sun has continued to move from the equator to the northern hemisphere. The days in the northern hemisphere are getting longer and shorter, and the nights in the southern hemisphere are getting shorter and shorter.

4. During the vernal equinox, China entered a bright spring except the Qinghai-Tibet Plateau, the northeast, the northwest and the northern part of North China. At this time, the climate is mild, the rain is abundant and the sun is shining, and the wintering crops in most parts of China enter the spring growth stage.