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
More Desktop Wallpapers:
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The town of Pienza in Tuscany, Italy
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Ubud, Bali, Indonesia
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A polar bear near Churchill, Manitoba, Canada
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Everest s shadow on the Himalayas
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Shenandoah National Park, Virginia
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In honor of those we ve lost
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Yosemite National Park anniversary
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A tower of light
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National Audubon Society s Christmas Bird Count
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Tigh Mor Trossachs on Loch Achray, Scotland
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Reindeer, Lapland, Finland
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Full moon
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Mandarin duck, Richmond Park, London, England
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Let s ride! It s Roller Coaster Day
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Square Tower House in Mesa Verde National Park
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A wild, craggy corner of the United States
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Falling for the Canadian Rockies
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The wild heart of Tasmania
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Knuthöjdsmossen, a nature reserve in Sweden
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How lovely are your branches
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A gentle wind fills this sail
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Total solar eclipse
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Chestnut-eared aracari in the Pantanal, Brazil
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The Zugspitze: Germany s highest point
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Village of Saranac Lake, New York
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High above the reef
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Extraterrestrial Culture Day
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A summertime light show
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World-class art comes to Arkansas
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Blackbird in Essex, England
Bing Wallpaper Gallery

