Fall Equinox 2024 Day 2. In different time zones, the date of the equinox may differ. Autumnal equinox — is an astronomical phenomenon, when the sun in its visible motion along the ecliptic crosses the celestial equator.
22, we’ll greet the fall equinox, when day and night become nearly equal in length. The autumnal equinox is when the sun crosses the celestial equator going south, marking the start of autumn in the northern hemisphere.