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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International Womens Day
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Coral Reef Awareness Week
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Katahdin Woods and Waters National Monument, Maine, USA
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Vieste, Apulia, Italy
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International Zebra Day
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Floating fruit market, Kaptai Lake, Rangamati, Bangladesh
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El Capitan in the Guadalupe Mountains National Park, Texas, USA
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The Painted Hills, Oregon
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As curious about you as you are about them
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Sea Otter Awareness Week
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Kalaloch Tree of Life, Olympic National Park, Washington, US
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Sunlight turning silver to gold
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Sharks, just living their lives
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The world’s greatest oasis?
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Saint Andrews Day
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A traboule in Lyon, France
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This lake is no mirage
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World Meteorological Day
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The only island in Lake Tahoe
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St. Barbaras Cathedral, Kutná Hora, Czechia
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International Lighthouse Weekend
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Amber waves of grain
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International Literacy Day
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Glastonbury Festival begins
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Skyscrapers in Manhattan
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Yellowstone National Park, Wyoming, United States
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Dunes at White Sands National Park, New Mexico
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Chilling out on an ice floe
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Pinnacles National Park, California, United States
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A 50-year balancing act
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