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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Prayer flags in Phobjikha Valley, Bhutan
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‘Hello’ from zero degrees longitude
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Best fronds forever
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Atolls in the Maldives
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Bird’s-eye view of the Golden Gate Bridge, San Francisco, California
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An ancient sailing tradition takes to the water
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A growing business
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World Space Week begins
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Bormio, Lombardy, Italy
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World Wildlife Day
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Medieval towers in Mestia, Upper Svaneti, Georgia
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Mount Pico, Portugal
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A predator at risk
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A step toward freedom
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Wooden path to Kennedy Lake, Vancouver Island, Canada
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Fall colors below Mount Sneffels near Ridgway, Colorado
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World Whale Day
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Celebrating Native American Heritage Month
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World Childrens Day
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Kofa National Wildlife Refuge, Arizona
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Aerial view of Plaza Mayor, Madrid, Spain
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International Zebra Day
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The fishing village of Reine, Norway
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Flock together for Cousins Day
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International Day of Friendship
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National Hummingbird Day
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Walking among the giants
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Wandering Watkins Glen
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The moth wonderful time of the year
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Memorial Day
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