Twice as much pi

I’ll have to mark this off for next year.

Tau Day is a celebration of the circle constant 𝜏=𝐢/π‘Ÿ= 6.283185… Founded in 2010 with the publication of [_The Tau Manifesto_]( by [Michael Hartl](, Tau Day takes place annually on June 28 (6/28 in the American calendar system).

Found via Spaf on Mastodon.