Center of Mass Coordinate System – 2-27-2013
http://www.artcompsci.org/vol_1/v1_web/node39.html
http://en.wikipedia.org/wiki/Center_of_mass
http://en.wikipedia.org/wiki/Center-of-momentum_frame
http://www.pa.msu.edu/~mmoore/Lect28_TwoBodyProb.pdf
Kepler Problem and Center of Mass Coordinates
http://www.math.ksu.edu/~dbski/writings/twobody.pdf
http://ocw.mit.edu/courses/physics/8-01sc-physics-i-classical-mechanics-fall-2010/central-force-motion/central-force-motion-and-the-kepler-problem/MIT8_01SC_slides28.pdf – best example of them all
http://www.northeastern.edu/afeiguin/p4840/p131spring04/node19.htm
http://www.youtube.com/watch?feature=endscreen&v=KnWfHZkhr3U&NR=1
http://www.youtube.com/watch?v=rvYoFt1-_k0