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When Is the Autumnal Equinox

Autumnal Equinox Marks First Day Of Fall

Space.com | Mike Wall | Posted 09.21.2013 | Science

The seasons will change this Sunday (Sept. 22), with the Northern Hemisphere moving into autumn and the South emerging from winter into spring. The ...

Autumnal Equinox Explained By Shifting Sunlight, Shadow

The Huffington Post | Cavan Sieczkowski | Posted 09.21.2012 | Science

Summer's warm days have ended, and the first day of fall approches. Technically speaking, the first day of fall is known as the autumnal equinox, ...