They say the only constant in life is change. In mathematics, however, there are many constants and today, we"re celebrating perhaps the most famous of them all: pi. This tasty-sounding constant is the ratio of a circle"s circumference to its diameter, approximately 3.14159. Every March 14, mathematics fans across the world get baking to mark Pi Day—a celebration of both the mathematical constant π and its delicious homophone, pie. It began in 1988, when physicist Larry Shaw connected the date (3/14) with the first three digits of this constant. Today, mathematicians and enthusiasts celebrate Pi Day with pie eating and pi reciting. Did you know that when your clock strikes 1:59 today, you will be three decimal places closer to the real value of pi? Pi is everywhere, even in nature. Pictured here is a bodhi tree in the shape of the pi symbol at Wat Phra Ngam, a temple in Ayutthaya, Thailand. Whether you"re a math geek or just in it for the treats, Pi Day is for everyone to enjoy!
Happy Pi Day!
Today in History
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Yellowstone National Park, Wyoming, United States
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Happy New Year!
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Squirrel Appreciation Day
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An iridescent view
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Gem of the Côte dAzur
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Charming Turenne
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We’re all smiles for World Hippo Day
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West of Windermere
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Rockefeller Centre Christmas Tree lighting
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National Mushroom Month
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Koala in the Great Otway National Park, Australia
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Guanacos, Torres del Paine National Park, Chile
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Folegandros Island, Cyclades, Greece
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Daiichi Tadami River Bridge, Fukushima, Japan
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Dubrovnik, Croatia
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Duomo Santa Maria del Fiore, Florence, Italy
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The Matterhorn reflected in Lake Stellisee, Zermatt, Switzerland
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Road to Hana, Maui, Hawaii, USA
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Natural Bridges National Monument, Utah, United States
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An endless stretch of sky
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The animal kingdoms great migration
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A day of swing and celebration
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Plum-headed parakeet
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Peggys Cove Lighthouse, Canada
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Finding maths in nature
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Leadenhall Market, London
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A rock giant
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What are these beautiful sandy waves?
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