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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Working for that cliffside view
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Jupiter and the Galilean moons
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1.1 billion opportunities for a better world
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Belgium celebrates its independence
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Least chipmunk, Kootenai National Forest, Montana
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Arenal Volcano, Costa Rica
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A bull, some flowers, and a stratovolcano
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Wind Cave National Park celebrates 120 years
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Art in the high desert
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Ancient storage in the Grand Canyon
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These patterns tell a story
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Drop in on International Surfing Day
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Chapel on the rock
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International Haiku Poetry Day
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Happy Pi Day!
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Pretty in pink, and purple, and red…
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Celebrating Native American Heritage Month
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Labor Day
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World Space Week
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Mount St. Helens National Volcanic Monument, Washington
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The Canary Islands, Spain
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Lighting it up for Vivid Sydney
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When an ideal microclimate gives you lemons…
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European hedgehog
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Venice Skatepark, Los Angeles, California
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World Bee Day
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Castilla-La Mancha, Spain
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Aerial view of a heart-shaped field in Trittau, Germany
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Christmas tree at Crystal Pier, San Diego, California
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