Vernal Equinox occurs on _____.
The vernal equinox, two moments in a year when the Sun is exactly above the Equator and day and night are of equal length; also, either of the two points in the sky where the ecliptic (the Sun’s annual pathway) and the celestial equator intersect.
In the Northern Hemisphere the vernal equinox falls about March 20 or 21, as the Sun crosses the celestial equator going north.
In the Southern Hemisphere, the equinox occurs on September 22 or 23, when the Sun moves south across the celestial equator.