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15 pinches is about one-fourth as big as a Golf Ball.
In other words, it's 0.227156710 times the size of a Golf Ball, and the size of a Golf Ball is 4.40224720 times that amount.
(per R&A-USGA Rules of Golf)
According to the Rules of Golf (as approved by the United States Golf Association and the Rules Committee of the Royal and Ancient Golf Club of Saint Andrews), a golf ball must have a volume of at least 66.033106 pinches. Golf balls are not required to have the familiar dimpled pattern, but the design has been popular since its invention in 1905 because it reduces drag while increasing lift.
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