When Is Spring Equinox 2025. Finally, let's see some curiosities about the equinox, the full moon and easter day. Equinox means equal day and night (12 hours each).
The spring equinox, marking the first day of spring in the northern hemisphere, occurs at 5:01 a.m. Spring equinox 2025 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic.