Autumnal Equinox 2025 Marks the Start of Fall on September 22
TL;DR
The autumnal equinox in the Northern Hemisphere in 2025 occurs on September 22 at 2:19 p.m. EDT, marking the start of fall, with the sun crossing the equator. The article explains the complexities of equinoxes, including atmospheric refraction and twilight effects, which cause day and night not to be exactly equal. It also clarifies misconceptions about polar daylight and darkness, highlighting that twilight extends the period of light or darkness beyond the simple day/night division.
- Autumnal equinox 2025 brings fall to the Northern Hemisphere on Sept. 22 Space
- Day and night get equal billing Monday as fall equinox arrives. Here’s what to know AP News
- How to Celebrate the Autumn Equinox With Seasonal Rituals Vogue
- What is the autumn equinox? A planetary look at when the first day of fall arrives USA Today
- Let Go & Start Fresh: The Fall Equinox Is Here refinery29.com
Want the full story? Read the original reporting
Read on Space