According to the former, beginning of spring is the beginning of spring. The vernal equinox is the midpoint of spring, which divides spring into two parts. The significance of the vernal equinox, first, refers to the equal division of day and night, each of which is 12 hours; Second, in ancient times, it was spring from beginning of spring to long summer, and the vernal equinox happened to be in the three months of spring, and spring was equally divided.