Fall Equinox Day 2025 Dates. An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length. On the day of the winter (december) solstice, the sun passes through the southernmost point of the.
Autumnal equinox โ is an astronomical phenomenon, when the sun in its visible motion along the ecliptic crosses the celestial equator. On the day of the winter (december) solstice, the sun passes through the southernmost point of the.
