Still a work in progress!
This is a JavaScript tool that simulates gravity in a simplified, two-dimensional version of our solar system, with the intenion of teaching fundamental aspects of orbital mechanics. It simulates the effect of all bodies – rather than using a patched conic approximation – in order to demonstrate more interesting phenomena such as precession.
No external dependencies and fully compatible with Internet Explorer, so there should be no problems running it.
See the current version of the simulation in action.