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On 28 June it is Tau (τ) Day, where we celebrate the new mathematical constant that has began a movement in modern mathematics. The Tau Movement suggests that actually, π can be a bit of a handful when doing Trigonometry, and that instead, a constant value of 2π, also known as Tau (τ).

The reason this weird value was chosen actually makes more sense when you look at a circle in Radians. A Radian is a measurement of an angle based on its Arc Length size compared to its radius. At Heart, the circumference of a circle is 2πr, which means that in radians, a circle has an angle of 2π.

Therefore τ, roughly 6.28318, is equal to 2π and defines the full cycle of a circle in radians. Tau is equal to a circle’s Circumference (C) divided by its radius (r), instead of Pi’s Circumference / diameter.

One of the challenges Tau faces is that π is more useful for day-to-day calculations using circles, while those who use radians on a regular basis would find Tau far more useful.

Tau day is held on the 28th of June, which appears to look like 6/28 in the Month-First date system. This is similar to Tau’s numerical value of 6.28318.