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Home | Celebrate Pi Day at the Exploratorium Today!

Celebrate Pi Day at the Exploratorium Today!

Pi Day at the Exploratorium

On Thursday, March 14, 2019, San Francisco's Exploratorium celebrates the 32nd Pi Day, an annual celebration of the mathematical constant and never-ending number—and Albert Einstein’s birthday! Did you know that the celebration of Pi Day originated at the Exploratorium, too?

The Exploratorium will open its doors to the community in honor of the celebration, and visitors can pay what they wish for entry between 10 am and 5 pm. Over the course of the day, Pi-themed activities will be offered throughout the museum, including demonstrations, discussion by Exploratorium educators, a traditional procession to the museum’s Pi Shrine, live music by Pi Day band “Mission Delirium,” and slices of fruit pie. The museum’s ongoing adult-only program, After Dark, will continue the Pi-themed festivities from 6 to 10 pm.

Pi Day at the Exploratorium

Pi Day was initiated at the Exploratorium by the late staff physicist, tinkerer, and media specialist, Larry Shaw. Shaw also created and installed the “Pi Shrine,” site of the annual Pi procession at the museum. Staff and visitors form a line and wind around the museum towards the Shrine. The procession ends with all participants circumnavigating the Pi Shrine 3.14 times while singing “Happy Birthday” to Albert Einstein.

An annual tradition for Exploratorium staff and visitors, Pi Day has grown into a worldwide event that is celebrated by math lovers and educators across the globe. In March 2009, Pi Day became an official U.S. national holiday. Pi Day is one of five Community Days at the Exploratorium, during which visitors are invited to pay what they wish. Entry to the Exploratorium on Pi Day is on a first-come, first-served basis.

Learn more about Pi Day and see the full schedule of events at

Photos © Exploratorium