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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Mangrove Conservation Day
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World Penguin Day
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Jamaica celebrates its independence
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Bidding summer adieu
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Eastern grey kangaroos in Australia’s Kosciuszko National Park
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Maloja, Switzerland
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Paralympic Games begin in Paris
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Prasat Phanom Rung temple ruins, Thailand
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Ceremony Hall at Sweden s Icehotel
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Midwinter freeze
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Museum Mile Festival
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National Bison Day
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Martin Luther King Jr. Day
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Feature Attraction: 85 years at the drive-in
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Flag Day
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Oxbow Bend on the Snake River, Grand Teton National Park, Wyoming
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Maritime forest on Cumberland Island, Georgia
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Punakaiki on South Island, New Zealand
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National Hispanic Heritage Month
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A new tradition in London
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Cue up the tango music
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Tide pools in La Jolla, California
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Broken Beach in Nusa Penida, Bali, Indonesia
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West Cornwall Covered Bridge, Connecticut
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American robin
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Blue paradise on the Costa Brava
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International Lighthouse Weekend
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Computer science on the page
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Penguin Awareness Day
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International Jazz Day