Tau Day

@TauDay

6/28 is #TauDay, a celebration of the true circle constant. Founded with The Tau Manifesto by @mhartl, which proposed using the name τ (tau) for C/r = 6.28…

The Platonic Realm

tauday.com

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Tau Day
@TauDay
Jun 28
Happy Tau Day! The first Tau Day was in 2010, so please enjoy the 2026 State of the Tau update in honor of tau’s Sweet Sixteen. And remember that it’s twice as sweet with twice as much pie! 😋
tauday.com
No, really, pi is wrong: The Tau Manifesto
For millennia, the circle has been considered the most perfect of shapes, and the circle constant π captured the geometry of the circle in a single number. But π is wrong, and it’s time to set things...
Tau Day
@TauDay
Jun 28, 2025
Some people might say the answer is π, but on today of all days it behooves us to write the answer as arctan(∞) − arctan(−∞) = ¼τ + ¼τ = ½τ. 🤓
The Math Flow
@TheMathFlow
Jun 27, 2025
Solve the improper integral.
Tau Day
@TauDay
Jun 28, 2025
Took a sec to realize this is a picture of Tau Day birthday boy @elonmusk, who turns 54 today.
jessica
@jessioa5
Jun 28, 2025
Tau Day.
Tau Day
@TauDay
Jun 28, 2025
Don’t cry—lots of people are celebrating Tau Day! x.com/search?q=tau%2…
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Tau Day
@TauDay
Jun 28, 2025
Do you remember when you joined X? I do! #MyXAnniversary #TauDay