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The Autumn Equinox Is on Monday. Here's What It Is and What to Know About It

This year, the autumnal equinox in the Northern Hemisphere falls on Monday, Sept. 22. If you want to be extra specific and mark it on your calendar, mark it for 11:19 a.m. PT. The meaning of equinox ...

Autumn Equinox: The Science Behind the First Day of Fall

This article was originally published on mentalfloss.com as Autumn Equinox: The Science Behind the First Day of Fall. A ...