The constant is equal to (2 times pi), and approximately . Tau Day — the true holiday — is celebrated on June 28th. The Greek letter τ, (tau) is a suggested symbol for the circle constant representing the ratio between circumference and radius. All individual email addresses on Tau Beta Pi websites are exclusively for use in the conduct of Tau Beta Pi related business. For millennia, the circle has been considered the most perfect of shapes, and the circle constant captures the geometry of the circle in a single number. The Tau Manifesto is dedicated to one of the most important numbers in mathematics, perhaps the most important: the circle constant relating the circumference of a circle to its linear dimension. In the system of Greek numerals, it has a value of 300.Letters that came from it include the Roman T and Cyrillic Т.. Other Uses. The name in English is pronounced / t aʊ / or / t ɔː /, but in modern Greek it is . A growing number of math lovers have begun to argue that a number called “tau,” which is two times pi, deserves at least as prominent a place in the math world as pi. So some of the more amusing reasons for preferring τ to π are: 1 Derivation 2 Applications 3 Geometric significance 4 Criticism 5 External links While there are infinitely many shapes with constant diameter, the circle is unique in having a constant radius. Tau (uppercase/lowercase Τ τ), is the letter of the Greek alphabet, used to represent the "t" sound in Ancient and Modern Greek. In a worldwide movement, mathematicians are pushing for a new number, tau, to be used instead of pi in math calculations involving circles, angles and calculus. What's more, tau makes a number of other calculations and equations more elegant, such as the equation used to calculate imaginary numbers (Euler's identity), Hartl said. The value of Pi is approximately 3.14 — or more accurately, 3.1419…, with digits that continue to infinity without ever repeating. So “Pi day” is March 14 (3/14). Some people want to use Tau in place of Pi, the special number that comes from circles.Tau would be equal to two times pi, or about 6.283. Tau, which equals 2 times pi, is a more natural and direct way to grasp how a circle's radius relates to the shape's circumference, Palais argued.That makes tau a more powerful constant, he said. Tau is 2 times Pi, or approximately 6.28 — or more accurately, 6.2832… So “Tau day” is 6/28. Tau / ˈ t ɔː, ˈ t aʊ / (uppercase Τ, lowercase τ; Greek: ταυ) is the 19th letter of the Greek alphabet.In the system of Greek numerals it has a value of 300.. Any other use, including recruiting and marketing, is strictly prohibited. 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