Long before pi had a name, people were drawn to its mystery. Every year on March 14, Pi Day highlights one of math"s most recognisable constants. The date reflects the first three digits of pi (π), the ratio of a circle"s circumference to its diameter: 3.14. Pi"s infinite, nonrepeating decimal has fascinated thinkers for a long time. The modern celebration began in 1988, when physicist Larry Shaw marked the day with a fitting tribute: serving pie.
Celebrating Pi Day
Today in History
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Grand Canyon National Park, Arizona, United States
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Perseid meteor shower over Nevada, United States
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Grasmere, Lake District, Cumbria, England
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Crowning jewel of London
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In hot water
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Fallow deer, Bradgate Park, Leicestershire, England
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The bears and the bees…
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Starry, starry night
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A delightful day for donkeys
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Dhaka, Bangladesh
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Sunset on Santorini
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Mount Rainier National Park, Washington, USA
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Wadden Sea coast, Friesland, Netherlands
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Rapa Valley in Sarek National Park, Sweden
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Armbrug bridge, Amsterdam, Netherlands
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Launching hopes and prayers
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Fit for a king
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Shark Awareness Day
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Spotted owlet, Bangkok, Thailand
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World Octopus Day
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Darwin Day
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World Otter Day
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Stealthy pollinators
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Christmas flowers
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Dusky eagle-owls, Pakistan
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Haghartsin Monastery, Armenia
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Town of Pienza in Tuscany, Italy
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The ‘eighth wonder’?
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World Water Day
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Nature’s blue wonder
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