What does the vernal equinox mean?

Both the vernal equinox and the autumnal equinox are one of the 24 solar terms. The vernal equinox is around March 22nd every year, which means that winter is over, and the autumnal equinox is around September 22nd every year, which means that winter begins slowly. At the vernal equinox, the length of day and night around the world is equal. After the vernal equinox, the days in the northern hemisphere are getting longer and shorter, and the nights in the southern hemisphere are getting shorter and shorter. At the autumnal equinox, the days and nights are equal, and gradually the days are long and the nights are short, and the climate changes from hot to cold.

The vernal equinox is one of the 24 solar terms and the fourth solar term in spring. The solar calendar reaches 0, and festivals are held on March 19~22 of Gregorian calendar every year. The vernal equinox is of great significance in astronomy, and the northern and southern hemispheres are equally divided day and night. After that, the direct position of the sun continued to move from the equator to the northern hemisphere, and the days in the northern hemisphere began to be longer than the nights. The vernal equinox also has obvious characteristics in climate. It's warm, rainy and sunny at this time. The solar term of the vernal equinox refers to the position where the sun is located between 0 and15 of the yellow meridian, that is, from the vernal equinox to Tomb-Sweeping Day, and the Gregorian calendar is from March 20th to April 5th. In ancient times, the vernal equinox was also called "Japan-China", "Day and Night Equinox", "Vernal Equinox" and "Ascending Equinox". The significance of the vernal equinox, first, refers to the equal division of day and night, each of which is 12 hours; Second, the vernal equinox is in the middle of spring (from beginning of spring to Changchun), and the spring is equally divided.