Woah! I didn't expect to see so much commentary on this particular thread. I had to re-subscribe a while longer.
Harry, the link you supplied on Feynman's Lost Lecture on Motions around the Sun did the trick for me. I finally get what your animated GIF was trying to tell me. I like what Feynman did with the empty foci. That is cool! Thanks! It will be interesting to see if I can find any linkages with what Feynman did and what I'm trying to work out with my own velocity vector work. You're working on a third way? Daniel, thank you very much for sharing the links to Gary Rubenstien's lectures on Newton's Principia Explained. Over the years I have actually generated a lot of animated computer code that essentially exploit Newton's principals. Doing do animates planetary orbits very nicely. It's fun to do. Indeed, I proved to myself that the area of each plotted triangle do equal each other. As long as one keeps individual iterations reasonably small the accuracy can turn out to be astonishing, several orders of magnitude accurate. Thanks for giving me another excuse to delay doing my house-work. Regards, Steven Vincent Johnson orionworks.com http://www.zazzle.com/orionworks http://stevenvincentjohnson.bandcamp.com/
