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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Hovering over harmonious horticulture
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A young bull moose, Denali National Park, Alaska, United States
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Happy Fathers Day!
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Merry Christmas!
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National Mushroom Day
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Scenic Mount Michener
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Yellowstone National Park, Wyoming, United States
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Park of the Monsters
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Our forgotten forests
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Orosei, Sardinia, Italy
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Victoria Day
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Black bear cub emerges into spring
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The road less taken?
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Mingan Archipelago National Park Reserve
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Commemorating Indigenous Peoples
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Mount Rainier National Park
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Spiralling upward...
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Bryce Canyon National Park, Utah, USA
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The world’s greatest oasis?
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Petroglyphs near Fruita in Capitol Reef National Park, Utah, United States
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Festival fever
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Annas hummingbird
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Kalaloch Tree of Life, Olympic National Park, Washington, US
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National Pumpkin Day
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Navy Pier, Chicago, Illinois, United States
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Celebrating Yi Peng
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Back to the future
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Celebrating Pi Day
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The old castle at sunrise
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The Three Musketeers Falls at Iguazú Falls, Argentina
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