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Atumnal Equinox

When:
September 22, 2008 @ 10:59 am – 11:59 am America/Chicago Timezone
2008-09-22T10:59:00-05:00
2008-09-22T11:59:00-05:00

The date (near September 22 in the northern hemisphere) when night and day are nearly of the same length and Sun crosses the celestial equator (i.e., declination 0) moving southward (in the northern hemisphere).

http://scienceworld.wolfram.com/astronomy/AutumnalEquinox.html

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