Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsFitting an Ellipse to the Orbit of a Star near the Galactic Centerhttp://demonstrations.wolfram.com/FittingAnEllipseToTheOrbitOfAStarNearTheGalacticCenter/]]>http://demonstrations.wolfram.com/FittingAnEllipseToTheOrbitOfAStarNearTheGalacticCenter/