Arlene Sashenka

First Day Of Spring 20243. But did you know there are actually three main definitions for the season coming. Here’s what to know about how we split up the year using the earth’s orbit.

The first day of spring (march equinox or vernal equinox) is when the sun shines directly on the celestial equator passing from south to north and the length of day. The vernal equinox arrives at 11:06 p.m.