http://demonstrations.wolfram.com/CurvatureOfTheTrefoilKnot/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
The blue disk is the osculating circle, also known as the kissing circle or the circle of curvature. The blue vector is in the direction of the principal normal and ends at the center of the osculating circle. It has length 1 / kappa, the radius of t...
Contributed by: Todd Will
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