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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Spire Cove in Kenai Fjords National Park, Seward, Alaska
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World Water Day
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Happy birthday to the Peak!
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The most Instagrammable bird?
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Rapa Valley in Sarek National Park, Sweden
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International Dark Sky Week
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Dance of the egret
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World Otter Day
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Hawaii Volcanoes National Park turns 103
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Edinburgh Festival Fringe
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Port de Saint-Goustan, Auray, Brittany, France
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Kelimutu, Flores, Indonesia
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St. James Tidal Pool, Cape Town, South Africa
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Marine Corps War Memorial, Arlington, Virginia
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Kagami-ike, Nagano, Japan
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Happy New Years Eve!
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Kings Mountain, Chugach Mountains, Alaska
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Mount Hamilton, near San Jose, California
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Glenariff Forest Park, Northern Ireland, UK
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Johnston Canyon in Banff National Park, Alberta, Canada
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Dusky eagle-owls, Pakistan
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Giant kelp in the Channel Islands National Marine Sanctuary
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Molokini Crater, Maui, Hawaii
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Fall for birding
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Chapel of St. Michel on Lake Serre-Ponçon, Hautes-Alpes, France
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Happy Bee Day to you
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Cenote near Puerto Aventuras, Mexico
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Tulips, Netherlands
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Abbey Gardens in Bury St Edmunds, England
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The frog prince?
Bing Wallpaper Gallery

