Definition:Equinox/Vernal

Definition
The vernal equinox is the equinox at which the sun crosses the celestial equator from south to north.

In the northern hemisphere this crossing occurs sometime around $21$ March.

Also known as
The vernal equinox is also known as the March equinox or the spring equinox.

The term northward equinox can also be seen in contexts requiring hemisphere neutrality.

Also see

 * Definition:Autumnal Equinox