Gravity on the Archimedes
by Matthew Segall

This program plots the orbits of a number of bodies under gravitational motion. When run, the program ask for the number of bodies, and for each body requests its mass, start position and initial velocity.

The program sets up function keys F1-F3 to provide three different situations. When the program requests the number of bodies, pressing any of these keys will start the program running with a particular set of bodies.
