Vernal Equinox 2024. The vernal equinox — is an astronomical phenomenon when the sun, in its visible motion along the ecliptic, crosses the celestial equator. In other words, on the day of the vernal.

When the vernal equinox takes place on. The start of astronomical spring, known as the vernal equinox, occurred yesterday, march 19, 2024, at 11:06 p.m.