Spring Equinox 2025. This astronomy calendar of celestial events contains dates for notable astonomical events in 2025 including moon phases, meteor showers, eclipses, planetary alignments, occultations, oppositions, conjunctions,. The first day of spring (march equinox or vernal equinox) is when the sun shines directly on the celestial equator passing from south to north and the length of day and night.

Equinox means equal day and night (12 hours each). For spring equinoxes for the next 12 years scroll down the page.