Vernal Equinox 2025. 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. In other words, on the day of the vernal equinox, day.

In other words, on the day of the vernal equinox, day. In the northern hemisphere, the march equinox is referred to as the vernal equinox.