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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Grand Canyon National Park turns 105
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Rockefeller Center Christmas tree lighting
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Happy 800th, Salisbury Cathedral
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International Day of the Snow Leopard
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World Penguin Day
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Russell lupines, Lake Tekapo, New Zealand
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The glowing waters of the Matsu Islands
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Meet the slowest flirt in the animal world
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Behold the perfect cone
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Champaka Sarasi, Shivamogga, Karnataka, India
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In the Highlands for Saint Andrew s Day
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Global commerce in motion
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Spotted eagle rays in the Galápagos Islands
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International Day of the Tropics
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Sanday Island and the North Sea, Scotland
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Blue hour in Trondheim, Norway
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In the belly of Fat Bear Week
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The 80th anniversary of D-Day
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International Surfing Day
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National Moth Week
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National Cherry Blossom Festival
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From garden to table?
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Feeling chic on Fashion Week
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Art in the chapel
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Unbearable cuteness
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Astoria-Megler Bridge, Oregon
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A lofty lighthouse and a little ocean spray
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On the lookout for Sheep-Cote Clod
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Sounds of Bach come to Bath
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High tide at the walled city
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