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Science What exactly is an equinox, anyway?

As Sunday ushered in the first official week of autumn, with the autumnal equinox setting Earth's Northern Hemisphere on a path to shorter days and colder temperatures. But what does the equinox really signify, and what's actually happening in the night sky? We break it down for you.

By Contributor / September 23, 2013

Sunday's equinox marked the transition from summer to autumn in the Northern Hemisphere and from winter to spring in the Southern Hemisphere. Here, we answer your most pressing equinox-related questions.