When Is The First Day Of Fall 2013? Everything To Know About The Autumnal (September) Equinox And Foliage Photos

 @nadinedeninnon.deninno@ibtimes.com
on September 20 2013 10:47 AM
  • First Day of Fall 2013
    Leaf-peeper alert! The first official day of autumn is this Sunday. Reuters
  • Harvest Moon 2013
    A passenger aircraft, with the full "Harvest Moon" seen behind, makes its final approach to landing at Heathrow Airport in west London, September 19, 2013. The Harvest Moon is a traditional name for the full moon that is closest to the autumn equinox, and at a traditional period where farmers would be harvesting crops. The moon's rise time and angle of path give the illusion that the Harvest Moon is both closer, larger and brighter; though actually it is not. Reuters
  • Fall 2013
    Leaves will begin to fall – if they haven’t already – on Sunday during the autumnal (September) equinox, which marks the first day of Autumn 2013. Twitter/@OhThatsAmazing
  • Fall 2013
    Pictured is a photo from Twitter user Shannon McMullan of leaves in Manitoulin Island, a Canadian lake island in Lake Huron, in the province of Ontario. Twitter/@shannonartsdiva
  • Fall 2013
    Leaves will begin to fall – if they haven’t already – on Sunday during the autumnal (September) equinox, which marks the first day of Autumn 2013. Twitter/@ilovegeekygirls
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Leaves may have begun to fall, but the first official day of Autumn 2013 isn't till Sunday, which marks the autumnal (September) equinox.

This year, fall will officially begin on Sunday, Sept. 22, and end Friday, Dec. 20. Coincidentally, fall began on the same day last year, but it usually varies according to the heavens.

The autumnal equinox, also called the September equinox, is when the sun moves across the celestial equator. In the Northern Hemisphere, the resulting effects include shorter days – made even shorter when Daylight Savings Time occurs -- and longer nights. By contrast, the Southern Hemisphere during the same equinox marks the beginning of shorter nights and longer days and heralds the beginning of spring.

This fall's equinox will happen at exactly 4:44 p.m. EST on Sunday as the sun appears to cross the equator. Days before the equinox, stargazers can catch the Harvest Moon on Wednesday night into Thursday morning. This seemingly bigger and brighter moon is merely the full moon falling closest to the autumnal equinox.

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