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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75 years of the United Nations
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Halemaumau Crater, Hawaii Volcanoes National Park
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Silbury Hill for International Archaeology Day
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Snow aglow in central Japan
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It s truffle season here in the Dordogne Valley
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Vote!
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Sandhill cranes, Bosque del Apache National Wildlife Refuge, New Mexico
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Is that a buzzing sound?
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Hot and Spicy Food Day
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Crested caracaras
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Monarch butterflies, Pismo Beach, California
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Oktoberfest
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Arbor Day
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Happy Thanksgiving!
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Male hooded merganser, Oregon
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Saint Andrews Day
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It’s NASA’s 60th birthday
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Honoring our veterans
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National Park Week: Guadalupe Mountains National Park
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Polar Bear Week
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In the Most Serene Republic
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Johnston Canyon in Banff National Park, Alberta, Canada
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Thick-billed raven, Simien Mountains, Ethiopia
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Zion National Park Turns 100
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Natural Bridges State Beach in Santa Cruz, California
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The parenting of a piping plover
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Welcome to Scotland s garden
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International Surfing Day
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Perseid meteor shower over Oregon
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Astronomy Day
Bing Wallpaper Gallery

