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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Spiegelgracht canal in Amsterdam, Netherlands
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Asteroid Day
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A prehistoric pavement
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Earth Day
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Daiichi Tadami River Bridge, Fukushima, Japan
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On the edge
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Splendid leaf frog
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A pine forest in Alsace, France
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International Talk Like a Pirate Day
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Wasson Peak, Saguaro National Park, Arizona, United States
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Launching hopes and prayers
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Colourful houses of Las Palmas de Gran Canaria, Spain
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Katahdin Woods and Waters National Monument, Maine, USA
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Methoni Castle, Messinia, Greece
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Where can you find this cute creature?
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Labor Day
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A time-worn mediaeval marvel
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Meon Hill, Gloucestershire
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The road less taken?
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Star Wars Day
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Knuthöjdsmossen nature reserve, Sweden
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Reflecting on Christmas
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Rothenburg ob der Tauber, Bavaria, Germany
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Mount Sopris, Colorado, USA
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World Meteorological Day
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Merry Christmas!
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‘Night shining’ clouds
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Grandparents Day
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Everglades National Park, Florida, United States
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Regal Radiance
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