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Photos: Pi Day Celebrations at 2015 SXSW Festival

Math enthusiasts celebrate Pi Day every year on March 14, to honor the mathematical constant that represents the ratio of a circle's circumference to its diameter. This year's event, however, happens just once in a century. Today, March 14, 2015, at 9:26 a.m. and 53 seconds, the date and time spelled the first 10 digits of pi: 3.141592653. Check out these photos of the "Pi Day of the Century" event at the 2015 SXSW Interactive festival in Austin, Texas. [Read full story about this year's Pi Day celebrations]

Sweet treats

Math enthusiasts all over the world celebrate Pi Day with its homophone, pie. (Credit: Tia Ghose/Live Science)

Pi(e) Day

The "Pi Day of the Century" event at the 2015 SXSW Interactive festival featured mini pies. (Credit: Tia Ghose/Live Science)

Rare event

Countdown to the "Pi Day of the Century." On March 14, 2015, at March 14, 2015, at 9:26 a.m. and 53 seconds, the date and time spelled the first 10 digits of pi. (Credit: Tia Ghose/Live Science)

Pi selfie

Live Science reporter Tia Ghose poses with a giant symbol of pi. (Credit: Tia Ghose/Live Science)

Neverending

The decimal representation of pi never ends and never repeats. (Credit: Tia Ghose/Live Science)

Circle fans

Pi is the mathematical constant that represents the ratio of a circle's circumference to its diameter. (Credit: Tia Ghose/Live Science)

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Live Science Staff
For the science geek in everyone, Live Science offers a fascinating window into the natural and technological world, delivering comprehensive and compelling news and analysis on everything from dinosaur discoveries, archaeological finds and amazing animals to health, innovation and wearable technology. We aim to empower and inspire our readers with the tools needed to understand the world and appreciate its everyday awe.