Fall isn"t just marked by the calendar. Each September, Earth"s subtle tilt brings the autumn equinox—one of two times a year when day and night are nearly equal in length. It marks the beginning of fall in the Northern Hemisphere. From solar alignments to changing leaves, nature offers its own quiet signals that the season has shifted. While for most of us it may seem like just another day, ancient cultures paid close attention to this change. Sites like Chichén Itzá in Mexico and England"s Stonehenge were designed to align with the rising or setting sun during equinox days.
Autumn equinox
Today in History
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Red deer stag in De Hoge Veluwe National Park, Netherlands
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Great cormorants
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International Day for Monuments and Sites
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Splügen Pass, Switzerland
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Anniversary of Pinnacles National Park, California
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Hey, who’s in charge here?
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Pi Day
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Pollinator Week
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Anniversary of the Endangered Species Act of 1973
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A wassailing we go
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Scottish Blackface sheep, Aberdeenshire, Scotland
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Ancient storage in the Grand Canyon
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A march toward a dream
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Frankenstein Friday
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Regional Park of Migliarino, San Rossore, Massaciuccoli, Italy
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Where is this gorgeous peak?
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Islands that turned the tide
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Playa del Silencio, Spain
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A tale of almonds and bees
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Diving into World Oceans Day
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Village of Zahara de la Sierra, Cadiz, Spain
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A storied trail marks a century
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Is this Minecraft headquarters?
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Baddest of the badlands
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Honoring the rangers on World Ranger Day
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Aerial view of a heart-shaped field in Trittau, Germany
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Trunks stick together
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Who s there? The largest owl in the world
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Summer Olympics begin in Paris
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Rock formations at Sedona, Arizona
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