What are the phenomena and implications of the vernal equinox?

On the vernal equinox, the length of day and night is equal, and there are also the following natural phenomena:

1. Late spring cold: Late spring cold is also a natural phenomenon in the vernal equinox season, which is caused by low pressure activity, cyclone development and cold air heading south. It is windy and rainy in the north, but in most areas, continuous rainy weather and late spring cold will gradually appear.

2. Warm-up: The vernal equinox season is also a season that represents rapid warm-up. In addition to the cold areas in winter all the year round and the areas north of 45 north latitude, all parts of China have begun to pick up, and all of them have begun to have vibrant scenes.

Moral of the vernal equinox: Day and night are almost equal.

The vernal equinox is one of the solar terms reflecting the changes of the four seasons and the fourth of the 24 solar terms. In ancient China, beginning of spring, Changxia, beginning of autumn and beginning of winter were used to indicate the beginning of the four seasons. The vernal equinox, summer solstice, autumn equinox and winter solstice are in the middle of each season. On the day of the vernal equinox, the sun shines directly on the equator, and the time between day and night is equal all over the earth, so the ancient vernal equinox and autumnal equinox are also called "day and night equinox", and there are "vernal equinox and autumnal equinox" among the people.