On Feynman’s analysis of the geometry of Keplerian orbits

@article{Kowen2003OnFA,
title={On Feynman’s analysis of the geometry of Keplerian orbits},
author={Michael Kowen and Harsh Mathur},
journal={American Journal of Physics},
year={2003},
volume={71},
pages={397-401}
}

A geometrical construction, introduced by Maxwell and Feynman to demonstrate that closed Keplerian orbits are elliptical, is adapted to show that open Keplerian orbits are hyperbolic or parabolic.

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