Happy Pie Day – 3 . 1 4 1 5 9 2 6 5 3 5 8 9
| Observed by | United States |
|---|---|
| Type | Mathematical |
| Significance | 3, 1, and 4 are the three most significant figures of π in its decimal representation. |
| Celebrations | Pie eating, pi memorization competitions, discussions about π[1] |
| Date | March 14 |
| Next time | March 14, 2023 |
| Frequency | Annual |
| First time | 1988 |
| Related to | Pi Approximation Day |