It was painful, but there was a time when they actually defined equations for the earth being the center of the solar system which matched observations.  The equations were a mess, but they managed to force the math into their hypothesis.  Then Copernicus came along.  Do you still believe the earth is the center of the solar system?<p>I&#x27;m sure you can twist the math upside down and get the same results defining gravity as a function of matter instead of as curved space time using some modified newtonian mechanics or such, but do you really believe that&#x27;s correct?