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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Cenote near Puerto Aventuras, Mexico
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Ready. Set. Snow.
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GOAL!
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Hooray, hooray, it s Unicorn Day!
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Silent night, sparkling lights, and hearts full of joy
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World Book Day
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World Rivers Day
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An opulent backdrop for a historic event
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Happy Presidents Day
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Great Salt Lake Shorelands Preserve in Layton, Utah
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It’s showtime for a precious crop
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World Childrens Day
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The Girl Scouts celebrate 110 years
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A horse of many colors
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For Hispanic Heritage Month: Out of Many, One
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Spotted eagle rays in the Galápagos Islands
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It s Independence Day in Mexico
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Let s celebrate cephalopods
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Venice Skatepark, Los Angeles, California
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Happy Easter!
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World Art Day
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A sea of swirling stone
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Honoring our fallen heroes
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Central Highlands of Vietnam
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World Jellyfish Day
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The Elbe in Dresden, Germany
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Strolling across the Red Lagoon
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Let us introduce you…
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International Day for Biological Diversity
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International Archaeology Day
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