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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Trooping the Colour
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Ancient town of Sorano, Tuscany, Italy
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High above the Aegean Sea
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Postcard from Italy
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Thomsons gazelles, Maasai Mara, Kenya
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Hovering over harmonious horticulture
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Mount Segla, Senja Island, Norway
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International Sloth Day
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Gwalior Fort, Madhya Pradesh, India
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Prasat Phanom Rung temple ruins, Thailand
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Maasai giraffes in Amboseli National Park, Kenya
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Château de Sully-sur-Loire, Centre-Val de Loire, France
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World Jellyfish Day
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Edinburgh cityscape and St Marys Cathedral steeples
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Notre-Dame reopens
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The Great Blue Hole, Belize
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Hello, is it tea you’re looking for?
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Moose, Denali National Park, Alaska, United States
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Were halfway there
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Out of this world
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Grandparents Day
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Go with the flow
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Cave Dale and Peveril Castle, Derbyshire
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What are these beautiful sandy waves?
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International Day of Peace
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International Day for Biosphere Reserves
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Grand Staircase-Escalante National Monument, Utah, USA
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A light in the coastal darkness
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Magnificent moss, magnified
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Where is this hidden waterfall?
Bing Wallpaper Gallery

