From: tjroberts137@sbcglobal.net   
      
   On 6/29/18 2:27 AM, John Heath wrote:   
   > [measuring the tick rates of SIGNALS from clocks A and B]   
   > > Neither A or B is qualified to make this measurement. Only a third party   
   > C in the middle of A and B can make this measurement as C can make this   
   > measurement with 1 clock , C clock , that can not have a bias that   
   > favors A or B as it is 1 clock only for both measurements.   
      
   You cannot dictate who can measure what -- any observer (clock) can   
   measure whatever it is capable of measuring, and the physical   
   theory/model should be able to correctly predict [#] the values   
   measured. If there is "bias" involved in the measurement, the   
   theory/model should reflect it. In this case, of course, GR accurately   
   predicts values measured by A, B, and C for the tick rates of signals   
   from the others.   
      
   	[#] I use "predict" with the physics meaning: calculating   
   	a value based on the theory and physical situation. History   
   	and time ordering between calculation and measurement are   
   	not relevant.   
      
   Tom Roberts   
      
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