Date | Event | Place |
---|---|---|

Jul 22, 2025 | Pi Approximation Day 2025 | World |

Jul 22, 2026 | Pi Approximation Day 2026 | World |

The first digits of the mathematical constant Pi on a blackboard.

**Significance:**
Pi Approximation Day is observed on July 22 (or 22/7 in the day/month date format), since the fraction 22/7 is a common approximation of the mathematical constant Pi, which dates from Archimedes.

Type:

Appreciation Days

Celebrations:

Celebrate Pi

Observed by:

Mathematicians

Location:

World

Initiator:

Mathematicans

Start year:

1980's