July 22 is Pi Approximation Day. Also known as Casual Pi Day, the day is dedicated to the mathematical constant pi (π).
Pi denotes the relationship between a circle’s circumference and its diameter and is denoted by the fraction 22/7 which calculates approximately to 3.14. One of the most widely recognized mathematical constant, π, is an irrational number, the digits of which repeat in a random fashion and are never ending.
People in countries that write their dates in the date/ month format celebrate Pi Approximation or Casual Pi Day on 22 July or 22/7. On the other hand, those who write their date in month/ date format celebrate Pi Day on March 14 (3/14 or 3-14) because the first three digits of the date correspond to the first three digits of pi - 3.14.
In recent years, some mathematicians and physicists have argued for the replacement of the π by tau and to celebrate Tau Day on June 28 instead of celebrating Pi Day or Pi Approximation Day.
Here are some ways you can celebrate this irrational, but fun holiday:
...that the sequence 123456 does not occur in the first million digits of pi?
| Fun Holiday: Pi Approximation Day Observances | |||
|---|---|---|---|
| Year | Weekday | Date | Name |
| 2017 | Sat | Jul 22 | Pi Approximation Day |
| 2018 | Sun | Jul 22 | Pi Approximation Day |
| 2019 | Mon | Jul 22 | Pi Approximation Day |
| 2020 | Wed | Jul 22 | Pi Approximation Day |
| 2021 | Thu | Jul 22 | Pi Approximation Day |
| 2022 | Fri | Jul 22 | Pi Approximation Day |
| 2023 | Sat | Jul 22 | Pi Approximation Day |
| 2024 | Mon | Jul 22 | Pi Approximation Day |
| 2025 | Tue | Jul 22 | Pi Approximation Day |
| 2026 | Wed | Jul 22 | Pi Approximation Day |
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