Orbit Simulation:

I was using the orbit simulation program last night with my college class.  I felt compelled to improve it.

Orbit circles are now aqua instead of dark blue, for visibility.

The trail of the satellites are now drawn using an array, instead of being a bunch of fading objects.  The situation before was making things far, far too slow.

I changed the basic speed increment from 0.1 to 0.05.  This gave better results for finding the right speed for the right orbit.

There is a new Canvas assignment that I'll post to Canvas Commons that uses more conceptual problems at the top and the more precise values for velocity.