Tau Day (τ)

Tau Day is on 28th June of every year.
The reason it is observed on this day is the first three digits of the value of tau is 6.28.

• the first digit (6) makes up the month June (6) and
• the next 2 digits (28) makes up the day (28).

∴ 28-Jun is observed as Tau Day.

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Given below are other interesting facts:
Pythagorean Theorem Day | Fibonacci Day | Pi Day | Phi Day | National Mathematics Day | e-Day (Euler's Number) | Pi Approximation Day | Tau Day | Square Root Day