You might hear the term "autumn equinox" tossed around Sept. 22 on the first day of fall. But what exactly does that mean? Is it different from a solstice? Yes, actually. They mark seasonal changes ...

The autumnal equinox arrives on 22 September, marking the end of summer and the beginning of autumn, heralding the arrival of chillier weather and the winter months. The autumnal equinox occurs in ...

Chillier weather, shorter days, hot mugs of apple cider and Halloween decorations aren't the only signs the seasons are changing. It's officially the first day of fall, based on astronomical data.

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, ...

It's fall, ya'll! Sweater weather is upon us. The beginning of the autumn season marks the end of warm summer days and the start of longer chilly nights. As the Earth travels around the sun, it does ...

What is the autumnal equinox? The autumnal equinox marks the start of autumn in the Northern Hemisphere. The Earth travels around the sun at an angle, and for most of the year, the Earth’s axis is ...

The Earth doesn’t sit straight up and down—it’s tilted on its axis at 23.5 degrees. That tilt drives all of our weather and creates an uneven distribution of heat and sunlight across the globe ...

Day and night will get equal time for a brief moment Monday as much of the world heads into fall. The autumnal equinox marks the start of the fall season for the Northern Hemisphere and the spring in ...