I have reloaded the files for the Planetary Orbit (Kepler's Laws) simulation at the PhysAstro Sims site. Hopefully everyone can now access that simulation along with the others at the site. The site URL is: http://www.edtechbybowman.net/PhysAstroSims/
Richard
Richard L. Bowman, PhD | Department of Physics | Professor of Physics
BRIDGEWATER COLLEGE, Bridgewater, VA 22812, USA
phone: 540-828-5441 | online: www.bridgewater.edu/~rbowman