Fall Begins Friday, Cooler Than Usual Day - NewsChannel5.com | Nashville News, Weather & Sports

Fall Begins Friday, Cooler Than Usual Day

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NASHVILLE, Tenn. (AP) - Fall is arriving, by astrological reckoning.

The season begins with the arrival of the autumnal equinox and signals equal hours of daylight and darkness.

The sun will be positioned over the Earth's equator at 4:05 a.m. CDT Friday.

While fall begins in the Northern Hemisphere, the event begins the spring season in southern latitudes.

Days become shorter, nights longer and temperatures cooler as the season progresses.

The National Weather Service predicts high temperatures on Friday at 76 degrees in Memphis and Chattanooga, 74 in Nashville, 73 in Chattanooga and 71 in the Tri-Cities -- all a half-dozen degrees below seasonal normal highs for the date. There will be a good chance of showers in East Tennessee.

(Copyright 2011 by The Associated Press. All Rights Reserved.)

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