What Day Is The Vernal Equinox In 2025. How many days until spring 2025? When is the first day of spring in 2025?
But what exactly is the vernal equinox, and why does it begin this year at 10:01 a.m. The vernal equinox โ is an astronomical phenomenon when the sun, in its visible motion along the ecliptic, crosses the celestial equator.