For the second time in 2025, an incredible astronomical event is about to change the seasons on Earth. The September equinox is almost upon us, with autumn about to begin in the Northern Hemisphere, ...

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 ...

September's new moon will be a special event this weekend, as it rises amid a partial solar eclipse — visible to only 0.2% of the world's population — and leads us all into the autumnal equinox. When ...