Philosophy 167: Class 9 - Part 7 - The Parochiality of Celestial Motion: Descartes' Physics and the Total Variability of Orbital Movement.
Smith, George E. (George Edwin), 1938-
Synopsis: Descartes believed, correctly, that the orbits of the planets are constantly changing, affected by one another, which undercuts the idea that underlying physics can be determined from observation.
Opening line: "This is now a totally different thing, but it's fairly important. I changed this slide today because it originally just had the top and the bottom."