History of Pi in Timeline

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Pi

Pi (π) is a fundamental mathematical constant representing the ratio of a circle's circumference to its diameter, approximately 3.14159. It is a ubiquitous number found in numerous formulas across both mathematics and physics. Notably, some of these formulas can be used to define Pi itself, offering an alternative approach that circumvents the need to explicitly define the length of a curve.

2010: Celebration of Tau Day

Since 2010, there has been a movement to celebrate Two Pi Day or Tau Day on June 28, driven by the proposal to replace π with τ = 2π in mathematical formulas.

2015: Pi Day Significance

In 2015, Pi Day was particularly significant because the date and time 3/14/15 9:26:53 reflected many more digits of pi, making it a noteworthy celebration for math enthusiasts.