When you buy through links on our articles, Future and its syndication partners may earn a commission. The September equinox is the official beginning of astronomical fall in the Northern Hemisphere.

Fall does not begin when the air turns crisp or when pumpkin spice shows up. It begins at a precise moment in space. In 2025, that moment lands on Monday, September 22, when the center of the Sun ...

Twice a year, Earth tilts just right, giving nearly equal amounts of day and night across the globe. One of those moments arrives Monday: the fall equinox, officially ushering in the arrival of autumn ...