Newtonian Theory of Photon Mass

The Newtonian theory is valid for x = 1, but as Horst Eckardt showed graphically, using values with x different from 1 can close the hyperbola, so light is trapped. The theory in UFT216 is completely new and valid for any m and M. It asumes that the photon orbits in a hyperbola, but the theory is valid for any conic section. I know that Gareth Evans and Trefor Morris have done very interesting work on photon mass, proving it in a very spectacular way.