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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World Nature Conservation Day
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Winter in the Finnish wilds
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Celebrating Helsinki’s birthday at the Kiasma Museum
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A bird of beauty
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Vila Franca Islet, São Miguel Island, Azores, Portugal
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Giving Tuesday
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Glacial rivers in Iceland
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At the foot of Dubrovnik s Gibraltar
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Independence Day of the Argentine Republic
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Palazzo Zuccari, Rome
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Happy Mothers Day!
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How do ladybugs winter?
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The Twin Cities celebrate Pride
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Sea Otter Awareness Week
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Umschreibung by Olafur Eliasson in Munich
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Hohenzollern Castle near Stuttgart, Germany
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Methoni Castle, Messenia, Greece
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It’s Giving Tuesday
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Reflections of the night sky
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The Bahamas as seen from the ISS
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Surf s always up in Paia
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Night view of the RMS Queen Mary, Long Beach, California
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Elbphilharmonie concert hall in Hamburg, Germany
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Sparkling ice diamonds on a black sandy beach
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Seasonal lights dazzle in Japan
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Diwali
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Design for Each and All
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Busy building wetlands
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Cloughoughter Castle, County Cavan, Ireland
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National Mushroom Day
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