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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Oktoberfest begins
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Can you see the family resemblance?
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Legacy mural in Philadelphia
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Islands of the Salish Sea
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A duckling swimming in a water meadow, Suffolk, England
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Grizzly bears in Alaska for National Wildlife Day
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Time to count some birds
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Happy 300th, NOLA!
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National Park Week: Yosemite National Park, California
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Feeling lazy? Today s your day.
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Cannes, France, in the spotlight
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World Theater Day
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National Park Service anniversary
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Happy Easter!
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Assembling the Smithsonian
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Whale hello there!
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Of moles and liquid nitrogen
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Happy Thanksgiving!
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Sitka shines on Alaska Day
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Southern right whale
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It s harvest time on World Food Day
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Mysterious prairie mounds abound
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Blue-footed booby, Galápagos Islands
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Río Arazas in Ordesa y Monte Perdido National Park, Spain
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An enduring vision
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International Polar Bear Day
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Wartburg Castle overlooking Thuringian Forest in Germany
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Ring-tailed lemur
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It’s Art Deco Weekend in Miami
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Keep shining