Spring Equinox In 2025. For a complete listing of the dates of the winter and summer solstices and spring and fall equinoxes through 2025, check out this site from the u.s. The spring equinox, known as the vernal equinox in the northern hemisphere, is a day on which the sun sits directly over the equator, so day and night all over the world are of equal length.

The equinox in the northern hemisphere occurs twice a year around 20 march (the spring equinox) and around 22 september (the autumn equinox). Spring equinox is the moment in which the sun enters aries.