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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.
