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At the autumnal equinox (today at 11:44:18 a.m., EDT), the sun appears to cross the celestial equator, an imaginary line through the sky, and appears directly above the equator, the imaginary line that divides the earth into the northern and southern hemispheres. When this occurs, the length of the day and the night are approximately equal at every place on earth.

Between the September, or autumnal, equinox, and the March, or vernal, equinox, the sun appears south of the equator. The word equinox is derived from the Latin word aequinoctium (equal night).



:haani flickr