Pi Approximation Day

July 22, Tuesday

Pi Approximation Day is a holiday celebrated on July 22nd (22/7 in day/month format) to honor the mathematical constant π (pi). The date is chosen because the fraction 22/7 is a common approximation of pi, which is approximately equal to 3.14159.

Why 22/7?
The fraction 22/7 is a rational approximation of the irrational number pi. While pi cannot be expressed exactly as a fraction, 22/7 is close enough for many practical purposes and has been used historically in mathematical calculations.

How is it Celebrated?
People celebrate Pi Approximation Day in various fun and educational ways, including:

- Hosting math-related games and activities
- Baking and eating pie as a pun on the word “pi”
- Holding math competitions or trivia
- Discussing the history and significance of pi in mathematics
- Creating art or poetry inspired by pi

Difference from Pi Day
Pi Approximation Day is different from Pi Day, which is celebrated on March 14th (3/14 in month/day format) to represent the first three digits of pi. While Pi Day is more widely recognized, Pi Approximation Day offers another opportunity to appreciate the importance of pi in mathematics.

Fun Fact
The use of 22/7 as an approximation for pi dates back to ancient times. The Greek mathematician Archimedes used this fraction in his calculations, making it one of the earliest known approximations of pi.

Pi Approximation Day is a lighthearted celebration that combines math, history, and creativity. Whether you're a math enthusiast or just enjoy a good slice of pie, it's a great day to recognize the fascinating nature of pi.

Pi Approximation Day – days left: 7. Create Countdown to Event

Pi Approximation Day in other years

2021 July 22, Thursday
2022 July 22, Friday
2023 July 22, Saturday
2024 July 22, Monday
2026 July 22, Wednesday

Pi Approximation Day in other countries