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.

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 ...

On Sept. 22, the autumnal equinox, which signals the start of fall in the Northern Hemisphere, finally brings an end to our long, hot summer on Monday at 2:19 p.m. EDT. This happens at a precise ...