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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American bison
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Gaztelugatxe at sunset, Basque Country, Spain
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Anza-Borrego Desert State Park, California
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Signs of life in the Empty Quarter
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Just a couple of yellow-billed hornbills
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Yungang Grottoes, Shanxi, China
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Great Smoky Mountains National Park, Tennessee
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Great Backyard Bird Count
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National Park Week: Canyonlands National Park, Utah
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Oktoberfest, Munich, Germany
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Endangered Species Act
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Storm rolls over the grasslands
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Loud waters
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Big Bend National Park turns 78
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The 80th anniversary of D-Day
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Chestnut-eared aracari in the Pantanal, Brazil
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Boxing Day in East Yorkshire, England
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Sea Otter Awareness Week
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Patriot Day
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White Desert National Park, Egypt
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The Tour de France begins
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Let’s have a ball
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International Day of Human Space Flight
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An octagonal architectural treasure
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A bohemian feline
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An ultralight aircraft flying over the sands of Namibia
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National Hummingbird Day
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Vasco da Gama Bridge, Lisbon, Portugal
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Bridge of Hillsborough County
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San Francisco Bay salt flats
Bing Wallpaper Gallery

