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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Cypress trees in George L. Smith State Park, Georgia
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Après-ski in the Dolomites
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National Garden Week begins today
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Meet the slowest flirt in the animal world
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Thousand Islands region, St. Lawrence River, US-Canada border
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River Quoich in Aberdeenshire, Scotland
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Northern gannets, Shetland Islands, Scotland
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Poppies for Armistice Day
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Flower of Life symbol drawn in snow
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Wildflower bloom, Central Valley, California
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Women s suffrage at 100
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Devils Tower National Monument, Wyoming
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International Haiku Poetry Day
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Jupiter and the Galilean moons
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Ruins of a royal temple
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Cool water in the Quinault
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Not your average sandcastle
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A monster view in Scotland
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In orbit for Yuri s Night
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Union Square, Manhattan
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Rainbow River, Rainbow Springs State Park, Florida
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Is there a bug-egg emoji for this?
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Mute swans
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World Lion Day
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Nothing plain about it
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Life goes on at the Beatles Ashram
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The mountain of 30,000 sakura
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One giant leap for penguins
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Blink and you ll miss it
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Mexican giant cardon cactus
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