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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You re feeling sleepy
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A grand event
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No, it s not a leaf. Happy Look-alike Day
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It’s NASA’s 60th birthday
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Mount Hamilton, near San Jose, California
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Christmas Bird Count
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Ayutthaya Historical Park, Thailand
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Indigenous Peoples Day
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Pamukkale, Turkey
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American goldfinch
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Grand Staircase-Escalante National Monument, Utah
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Blue paradise on the Costa Brava
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Wychwood Forest, Oxfordshire, England
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Desert rose of Qatar
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Brocken spectre in Central Balkan National Park, Bulgaria
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Sligachan Old Bridge, Isle of Skye, Scotland
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World Meteorological Day
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Koala in the Great Otway National Park, Australia
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Staring down winter
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Oh, the places you’ll go
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Blue Lagoon spa, Grindavík, Iceland
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Astrotourism at its finest
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From the mind of Frank Gehry
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The Hermitage of Santa Justa
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Celebrating 200 years of statehood
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There once was a lighthouse from...
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The ruins of Italica, Andalusia, Spain
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How do ladybugs winter?
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Christmas comes to New York City
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In the valley of the doll
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