Physics

Seasons and ecliptic simulator

URL: http://astro.unl.edu/classaction/animations/coordsmotion/eclipticsimulator.html

Planetary Orbit Simulator

URL: http://astro.unl.edu/naap/pos/animations/kepler.html

More simulation on http://astro.unl.edu/animationsLinks.html

Google Sky Map

URL: http://www.google.com/sky/