vorticity: This cache is one of the last serving efforts from Hiking Fool who was John May. John was all but a PhD in Math. He worked many years in highly classified jobs teaching Air Force space officers the orbital mechanics they needed to understand how to fly satellites. John was a phenom and sadly died of a rare form of cancer. The problem with this cache, and the reason I am archiving it, is because the RELATED WEB PAGE is now defunct. Though I adopted this cache, I do not have access to what was there. Apologies if you’re working on it. Archived. Vort.