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				Figuring out coordinates in 3D Space
			 
 On an online game that I run, I'm going to try to design a simulation of actual planetary movement around a central point or star.  The only problem is, I can't figure out the relationship between the central point to the planet and how it'd move.  If anyone has some ideas on what to look around for and where I should look, I would be greatly appriciative.
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