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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Winter solstice
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A glowing square of squares
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Eurasian red squirrel in Northumberland, England
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Anniversary of Natural Bridges National Monument, Utah, United States
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Bandon Beach in Bandon, Oregon, United States
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Past below, future ahead
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World Penguin Day
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Castle Stalker, Argyll, Scotland
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World Heritage Day
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Gujō Hachiman Castle, Gifu Prefecture, Japan
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A young bull moose, Denali National Park, Alaska, United States
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St. James Tidal Pool, Cape Town, South Africa
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Anshun Bridge, Chengdu, China
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Napping near the North Pole
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Wooden path to Kennedy Lake, Vancouver Island
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Tom McCall Waterfront Park, Portland, Oregon, USA
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Wind-powered ice racing
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The Great Blue Hole, Belize
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Plate ice along Lake Superior, Grand Marais, Minnesota, United States
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Kenny Lake, Lake Superior Provincial Park
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Magnified moss
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Christmas Day
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Lençóis Maranhenses National Park, Brazil
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A pine forest in Alsace, France
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Kodiak National Wildlife Refuge, Alaska
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Mona Vale rockpool, Sydney, Australia
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Pacific Rim Whale Festival
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Highway through Xitai Jinaier Lake, Qinghai Province, China
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Canadian Grand Prix 2025
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Poinsettia Day
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