Equinox Sky Alert: Northern Lights, Planet Parade & More Dazzle Sept 22–23, 2025
Earth reaches the autumnal equinox at 18:19 UTC on Sept. 22, marking the start of fall in the Northern Hemisphere. NOAA forecasts minor geomagnetic storms Sept. 21–23, raising chances for auroras farther south than usual. Saturn is at peak brightness after opposition on Sept. 21. A partial solar eclipse dimmed skies over New Zealand and the South Pacific on Sept. 21–22.