What does the vernal equinox mean? What does the vernal equinox mean?

The vernal equinox is the midpoint of 90 days in spring. One of the 24 solar terms, around March 20 of the Gregorian calendar every year. The vernal equinox of 20 18 is March 2 1. The vernal equinox, autumnal equinox, winter solstice and summer solstice are also called two points and two solstices, which are the four most important symbolic solar terms among the 24 solar terms. The vernal equinox usually refers to the moment when the sun's ecliptic is at 0, which is around February 15 of the lunar calendar every year (March 20-2 1 of the Gregorian calendar).

The twenty-four solar terms say, "Mid-February. The division is half, and this is half of ninety days, so it is called division. " At the vernal equinox, the sun reaches the meridian zero, which happens to be in the middle of February. Because the vernal equinox is divided into two halves, it is called the vernal equinox.

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 vernal equinox, the sun shines directly on the equator, and the time between day and night is equal all over the earth. Therefore, the ancient vernal equinox and autumnal equinox are also called "equinox", and there is a folk proverb that "vernal equinox and autumnal equinox are equally divided day and night".