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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Let’s go to the Ex!
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Surrounded by a sea of sand
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Yellowstone National Park, Wyoming
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Winter at Valley Forge
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Willamette National Forest, Oregon
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A dramatic celebration of peace
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World Hippo Day, a giant celebration
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Brown-throated three-toed sloth
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World Penguin Day
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A cantilevered window to the past
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Golden Gate Bridge, San Francisco, California
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Basilica of Santa Maria della Salute, Venice, Italy
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Remembering D-Day
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International Trails Day
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An oasis in the desert
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A future built on the past
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Salzburg, Austria
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Standing on glass 275+ metres in the air
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Gwalior Fort, Madhya Pradesh, India
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Abraham Lake, Alberta
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A life-sized snow globe
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Wadden Sea coast, Friesland, Netherlands
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The 80th anniversary of D-Day
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Blooming lupines in Newfoundland
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Iguazu Falls at the border of Argentina and Brazil
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Purple crocus flowers, Seven Rila Lakes, Bulgaria
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Fogo Island, Newfoundland and Labrador
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Lago Pehoé, Torres del Paine National Park, Chile
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Cypress trees in George L. Smith State Park, Georgia, United States
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