What Day Is The Equinox 2024. The vernal equinox โ is an astronomical phenomenon when the sun, in its visible motion along the ecliptic, crosses the celestial equator. The first day of astronomical fall is sunday and that means cooler and shorter days.
The equinoxes occur around march 20 and september 22 each year, corresponding to an equal length of day and. In 2024, it will take place on.