Happy Fall 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,. Sunday, dec 21 10:03 am est.

The autumn or fall equinox signals the end of summer on the astronomical calendar. Mabon (march 20, 2025) also known as: