When Is Equinox 2024 Calendar. In the northern hemisphere, these are known as the spring, or vernal, equinox and the fall, or autumnal, equinox. Equinoxes and solstices are two of the most important celestial events on earth.

Cdt) on september 22, 2024. Spring equinox 2024 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic.