Vernal Equinox Date 2025. The vernal equinox โ is an astronomical phenomenon when the sun, in its visible motion along the ecliptic, crosses the celestial equator. What is the spring equinox and what happens on.
Tuesday, march 19 marks the vernal equinox, bringing the first day of spring to the northern hemisphere. The vernal equinox โ is an astronomical phenomenon when the sun, in its visible motion along the ecliptic, crosses the celestial equator.