excellent quondum and though i think in the redirect a slightly larger discussion of the advantages of using tau would be helpful in understanding why anyone could have thought of a seemingly unorthodox mathematical proposal the redirect already has the advantages of the notation of a turn in terms of tau like a half revolution would be tau but i believe a small discussion on the advantages on the sine function like in this old vi hart video would very much strengthen the argument it doesn't have to be large or maybe that could appear on the sine page