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    MATERIAL FROM CLASS 5: Wednesday September 20

  • retrograde motion of Mars, including an animation (NASA JPL)
  • Kepler's model of planet orbits as regular solids

    Click here for an applet that shows you how a planet moves according to Kepler's laws.

    ERROR IN THE TEXTBOOK

    On page 57, Kepler's 3rd law is given as P2 a3 = k; this should be P2 / a3 = k.