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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Przewalskis horses, Hustai National Park, Mongolia
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Colorful cows of the reef
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Roman bridge of Córdoba, Spain
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Gulf Islands National Seashore, Florida
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Atrani, Amalfi Coast, Italy
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World Lizard Day
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Tortula moss, Netherlands
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Andermatt village in the Alps, Switzerland
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Prasat Phanom Rung temple ruins, Thailand
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Frost-covered dunes on Mars
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Fish River Canyon, Namibia
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Happy International Astronomy Day!
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Row, row, row your gondola
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Waiting for winter
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Gauchos showcase Argentina’s independent spirit
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Talampaya National Park, Argentina
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Rock formations at Sedona, Arizona
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Lace up your hiking boots for Mountain Day
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Sky island views
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Bowling Ball Beach in Mendocino County, California
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Boating on the Bojo
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Lake Tekapo, New Zealand
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Last day of National Park Week
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The tale of squirrels like Nutkin
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World Turtle Day
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Westerheversand Lighthouse
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Leaves of Grass
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Tesla, the visionary
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Ruins of Inca temples and terraces on Huayna Picchu, Peru
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The long and wiggling path
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