The fall (autumnal) equinox in 2025 occurs on Monday, September 22. On this day, the sun crosses the celestial equator going south, resulting in nearly equal day and night length. Specifically, the exact time of the equinox in 2025 is September 22 at 18:19 UTC (2:19 PM EDT).
This marks the official beginning of fall in the Northern Hemisphere, where day and night are approximately equal in length due to the Earth's axis being neither tilted toward nor away from the Sun at that moment.
