Fall is in the air—officially. The September equinox marks the transition from summer to autumn in the Northern Hemisphere, while in the Southern Hemisphere, spring is just beginning. The term "equinox," derived from Latin, means "equal night." It marks one of two points during the year when the sun sits directly over the equator, and the Earth receives roughly equal amounts of daylight and darkness.
Autumnal equinox
Today in History
More Desktop Wallpapers:
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Navajo Bridge in Marble Canyon
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Surfer s paradise
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A treaty for science
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Autumn in the Prosecco Hills
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Honoring our veterans
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Happy trees = Clean air
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Happy Thanksgiving from an expert face-stuffer
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The natural ice wall of Misotsuchi, Chichibu, Japan
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The ‘Living Forest’ in Biscay, Spain
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Yarn for Distaff Day
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Sunburst at Angkor
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Wheels up in Beijing
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World Children s Day
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Bryce Canyon National Park, Utah
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The Great Glen
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Porcupine
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Where is this wintry road?
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International Roller Coaster Day
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Christmas Bird Count
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Celebrating Pi Day
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National Park Service Founders Day
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Happy Hobbit Day
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Celebrating National Dentist Day
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European beech forest, Belgium
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Iguazu Falls at the border of Argentina and Brazil
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A visionary artist paints his own garden view
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Bringing together history and technology
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International Day of Human Space Flight
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Nighttime view over the Gulf Coast
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The birthplace of Cinco de Mayo
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