Duration: 21:44

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Check out Grant’s channel: 3blue1brown: https://www.youtube.com/3blue1brown

This video recounts a lecture by Richard Feynman giving an elementary demonstration of why planets orbit in ellipses. See the excellent book by Judith and David Goodstein, "Feynman's lost lecture”, for the full story behind this lecture, and a deeper dive into its content.

Tweet referenced at the start: https://twitter.com/3blue1brown/status/1016936129117937664

Music by Nathaniel Schroeder: https://soundcloud.com/drschroeder/elizabeth-the-mouse
Music by Vincent Rubinetti: https://soundcloud.com/vincerubinetti/one-two-zeta

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Created by Henry Reich