Pi day 2026: history, significance, fun activities, rituals, Einstein’s birthday, and MIT admission traditions explained

Pi Day, celebrated annually on March 14, honors the mathematical constant Pi (π), the ratio of a circle's circumference to its diameter. This irrational number, approximately 3.14, is fundamental to mathematics and science. Celebrations worldwide include pie feasts, Pi Processions, and educational activities, highlighting Pi's enduring fascination and cultural impact.