Reference:

• http://www.stellarium.org/
• http://www.shatters.net/celestia/
• space.jpl.nasa.gov
• www.solarsystemscope.com/sunaeon/
• www.solarsystemscope.com/
• https://janus.astro.umd.edu/SolarSystems/
• http://www.stjarnhimlen.se/comp/tutorial.html
• http://www.davidcolarusso.com/astro/
• http://ssd.jpl.nasa.gov/txt/aprx_pos_planets.pdf
• http://www.sjsu.edu/faculty/watkins/orbital.htm
• http://users.softlab.ece.ntua.gr/~ttsiod/gravity.html
• http://www.fourmilab.ch/cgi-bin/Solar/action?sys=-Sf
• http://www.theplanetstoday.com/
• Planets orbital elements from NASA’s Jet Propulsion Laboratory.
• http://clowder.net/hop/index.html
• http://threejs.org/
• http://threejs.org/docs/#Reference/Math/Vector3
• http://planetpixelemporium.com/earth.html
• http://www.amazon.com/Lunar-Tables-Programs-4000-B-C/dp/0943396336/ref=la_B001KCIJBE_1_1?s=books&ie=UTF8&qid=1385044209&sr=1-1
• http://www.mathworks.com/matlabcentral/fileexchange/authors/30927

Other Links:
• Useful resource e-links related to 'Interaction Design'
• Interaction Design at IDC, IIT Bombay

Case Study Download:
• Odyssey - Understanding Solar System......