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
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Great Fountain Geyser, Yellowstone National Park, Wyoming
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New Year s Day
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Ring-tailed lemur
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World Population Day
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A look at Uranus, seventh planet from the sun
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Rice terraces of Mù Cang Chải, Yên Bái province, Vietnam
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Palouse farmland, Washington state
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International Day of Human Space Flight
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An enduring vision
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Happy New Year!
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Computer science on the page
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National Hispanic Heritage Month
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A visionary artist paints his own garden view
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Over and under the delta
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Bohemian waxwings in Canada
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World Rainforest Day
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Eye of the cave
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A sizzling summit hides in the clouds
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The Spirit of Harlem by Louis Delsarte
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Audubon Christmas Bird Count
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Brocken spectre in Central Balkan National Park, Bulgaria
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Happy Halloween!
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World Art Day
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Sibiu Christmas market, Romania
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Southern right whale
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Val Gardena, South Tyrol, Dolomites, Italy
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Let s face it: It s World Emoji Day
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Fall comes to the Last Frontier
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A winter wonderland in Northeast China
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National Hammock Day
Bing Wallpaper Gallery

