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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National Cherry Blossom Festival
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St. Patricks Day in County Waterford, Ireland
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Colosseum, Rome, Italy
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Southern gemsbok in the savannah, Botswana
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Sandhill cranes, Bosque del Apache National Wildlife Refuge, New Mexico
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Caribbean flamingos, Yucatán Peninsula, Mexico
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A silent witness to history
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Rice terraces of Mù Cang Chải, Yên Bái province, Vietnam
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Darwin Day
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Stari Most in Mostar, Bosnia and Herzegovina
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Wallabies at sunrise, Australia
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A Eurasian lynx in Siberia
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Valentines Day
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Summer Olympics begin in Paris
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Museum Mile Festival
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Bathing in the light of Pride
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Manhattan
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A seabird gets schooled
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Rosa Parks Day
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World Sea Turtle Day
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Manatee Awareness Month
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National Trails Day
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A Bengal tiger in Ranthambore National Park, India
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Flag Day
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World Elephant Day
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Bowling Ball Beach in Mendocino County, California
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Rice fields at Sapa, Lào Cai, Vietnam
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Dog days of summer
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A goldie gala
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Pi Day
Bing Wallpaper Gallery

