There is no, and can be no solution, because realistically, the physics work the same. One is just easier to explain mathematically as a whole.<br /><br />Its like two cars pointed towards eachother, and are closing in at 100 miles per hour. <br />Is car A moving 100 miles per hour and car b is stationary?<br />is car b moving 100 miles per hour and car a is stationary?<br />Is car A going 40 miles per hour towards B, and B is going 60 miles per hour towards A?<br />Is car A going 150 miles towards car B, and B is driving backwards at 50 miles an hour to get away from A?<br /><br />when they hit, is the damage any different?<br /><br />Throw einstiens frame of references into it...<br /><br />if there is nothign at all to base motion off of, other than the other vehicle, then passangers in A, and passangers in B can calculate collision as if they were standing still, and the other was heading towards them. OBVIOUSLY one is moving, but for the sake of measurement... it doesnt matter wich one.<br /><br />Naah, the only way to prove it, is to ignore earth. you can argue easilly, and fit geocentric view, that mercuy and venus orbit the sun. "Suns moons" so to speak. It matches observed whether earth travels around sun, or vice versa. Now, does mars rotate around the sun, or around earth. The loops in the view of a geocentric that cross the suns path can be analogous to the loops in both mercury and venus, showing that mars indeed rotates aroudn the sun, but at a farther distance than venus or mercury does. Further proof of that can be by showing the moon rotates around the earth in a near circle, the sun rotates around the earth in a near circle, why would God change soemthing that works? notice, Im still concernign myself with a geocentric view. You can get them to agree, then, that the rest of the planets rotate around the sun, and then the solarsystem as a whole rotates around the earth.<br /><br />at this point, we back to the "which car is moving analogy" and in junction