http://www.physics.buffalo.edu/gonsalves/ComPhys/Chapter4/oct8.html
http://www.pas.rochester.edu/~blackman/ast104/newtonkepler.html
http://einstein.stanford.edu/Media/Newtons_Universe_Anima-Flash.html
http://www.physics.purdue.edu/class/applets/phe/keplerlaw1.htm
http://www.physics.purdue.edu/class/applets/phe/keplerlaw2.htm
http://www.cuug.ab.ca/kmcclary/goodjar/image.html
Fun with gravitation:
http://arachnoid.com/gravitation/
http://arachnoid.com/gravitation/small.html
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