On Wed, Jan 22, 2020 at 5:40 PM Jürg Wyttenbach <[email protected]> wrote:
> Unluckily the earth is not flat even in the curved sense as it is an > ellipsoid with at least a delta north-south/east-west in radius of about > 10km. > > Even more unluckily gravitation is not a constant it slightly depends on > the density of matter. And last but not least gravity is a force and not > just a curvature of space. From a mathematical point of view there is no > difference between the two views as long as you do not believe that the > gravity force is of purely central nature. > The idea of curvature emerged because physicist had no clue why a photon > could be attracted by a mass. But all EM-mass interact with other EM mass > what leads to the other erroneous picture of virtual particle background. > I you once understand why/how all mass is EM-mass, then you also will > understand all mistakes of 100 year physics. > > J.W. > > PS: Who will construct this perfect cannon that is able to do a shot > exactly along the horizon line? Not Boing... > > > Galileo was the first person to introduce the concept of compound motion into the study of projectile motion. For him a projectile fired horizontally was a combination of two motions: A constant horizontal motion plus a constant downward acceleration. (Btw, he only used a horizontal law of inertia as a rule of thumb. Descartes was the first to propose a universal law inertia for all directions). Prior to Galileo this would have been considered strange, because such motion was viewed as an expression of wholeness, rather than as an expressing of parts. Harry >
