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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Joshua Tree National Park
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Happy International Astronomy Day!
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World Oceans Day
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Can you see the family resemblance?
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Lighting it up for Vivid Sydney
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Celebrating Madagascar on its Independence Day
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Happy Panda Day!
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To Roswell, and beyond!
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World Octopus Day
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A stunning national park in winter white
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Celebrating 30 years of eye-opening images
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World Elephant Day
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The forecast calls for blooms
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Steyr River, Austria
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Regional Park of Migliarino, San Rossore, Massaciuccoli, Italy
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World Bee Day
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Victory Day in Valletta
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Rockin with the rockhoppers
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World Oceans Day
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Party like it’s 5779
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An unlikely friendship in the wild
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Ancient town of Sorano, Tuscany, Italy
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A monster view in Scotland
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Corona Arch near Moab, Utah
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In the Red Sea for World Dolphin Day
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European hedgehog in Sussex, England
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Vasco da Gama Bridge, Lisbon, Portugal
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Uredd Rest Area, Norway
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World Olive Tree Day
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Celebrating Norwegian Constitution Day
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