Fall Equinox 2025. Edt, and the season will last for approximately 89 days and 20 hours, to december 21. 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,.

Equinox means equal day and night (12 hours each).it is a time for balance. In greek mythology, the fall equinox marks the return of the goddess persephone to the underworld for three months, where she is reunited with.