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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Discovery Day in Yukon, Canada
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A monastery in the mountain
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International Day for Monuments and Sites
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Ruins of a royal temple
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March of the flowers
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Castelmezzano, Italy
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Honoring the fallen
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A star blows a bubble
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International Haiku Poetry Day
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Jane’s Carousel delights
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Day of the Dead
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Go Fly a Kite Day
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A silent witness to history
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Grand Teton National Park, Wyoming
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Go Fly a Kite Day
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Great hornbill, Thailand
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World Water Day
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International Day for Monuments and Sites
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Breckenridge, Colorado
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Abbey Gardens in Bury St Edmunds, England
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Playa del Amor, Marietas Islands, Mexico
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Three cheers for polar bears!
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Struck by Southwestern beauty
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Watch your step
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Happy Independence Day!
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Bearded reedlings in Flevoland
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From Sputnik to extraterrestrial storms
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Just another day in paradise
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Málaga, Spain
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San Francisco Bay salt flats