Pi Day is an annual celebration commemorating the mathematical constant pi (π). It is observed on March 14 since 3, 1, and 4 are the first three digits of pi.
The earliest known official celebration of Pi Day was organized by Larry Shaw in 1988 at the San Francisco Exploratorium. On March 12, 2009, the U.S. House of Representatives passed a resolution recognizing March 14 as National Pi Day.
Pi
Pi (π) is the mathematical constant that has been known for almost 4000 years. Its value is the ratio of any circle's circumference to its diameter in Euclidean space (C=πd), or the ratio of a circle's area to the square of its radius (A=πr2). The value of pi is approximately equal to 3.141592653, but it is an irrational number and its decimal representation never ends or repeats. You can remember the first digits of pi (3.1415926) by counting each word's letters in "May I have a large container of coffee?"
Credit: wikipedia
Who: Let's celebrate! You meet the nicest people geocaching! Do you recognize anyone in this photo of the event in 2015 (with souvenir, ten years ago)?
What: Pi Day Pie Exchange. If you would like to participate in a pie exchange, bring a pie---homemade or bakery special---apple, banana cream, blackberry, cherry, key lime, lemon meringue, peanut butter, pecan, pumpkin, or ... ? Cut it into eight slices and plan to exchange pieces with other participants, so you'll have a fun selection of desserts all week. That is, of course, unless you decide to sample your trades with a cup of coffee or tea at the event! Or just come for dessert and some fun! Plus: Teamwork games and jigsaw puzzles
Where: Kitsap Regional Library Poulsbo Community Room . Park in lower lot.
When: Friday March 14th (3.14) 6:00-8:00 pm
In 2025, geocachers can earn the Pi Day souvenir by finding and logging any Mystery Cache between Friday, March 14 and Sunday, March 16:
Community Celebration Events - 2025
This Event is part of a limited release of Community Celebration Events to celebrate 25 years of geocaching. Geocachers hosted events between January 1, 2025 and December 31, 2025. Learn more about Community Celebration Events on the Geocaching Blog.