1, the vernal equinox is the fourth of the 24 solar terms and the fourth of the six solar terms in spring. The vernal equinox begins on March 20th (or 2 1) and ends on April 4th (or 5th) every year.

2, the vernal equinox, the position of the finger (due east). Every year on March 20th or at 2 1 day of Gregorian calendar, the sun starts when it reaches 0 degrees of the yellow meridian (vernal equinox). The length of day and night is average, just half of the 90th day of spring, so it is called "vernal equinox". In ancient times, it was also called "Japan-China", "Day and Night" and "Mid-spring Moon".