Tau Day is a celebration of the circle constant $\tau = C/r =$ $ 6.283185\ldots$ Founded in 2010 with the publication of
by
, Tau Day takes place annually on June 28 (6/28 in the American calendar system).
The Tau Manifesto’s introduction of $\tau$ (tau) as the “true circle constant” has had a significant impact on geek culture, including changing the
MIT announces its admissions decisions, being featured in the official
, and being supported by a large number of computer programming languages (including Microsoft .NET, Java, Rust, and Python).
Including the English-language original, The Tau Manifesto is currently available in eight different languages. Its associated holiday,
, has been
featured in The Wall Street Journal
and is celebrated annually on
by thousands of math enthusiasts around the world.
To get all the latest updates on tau, read the
, and
join the official Tau Email List
.