From: carlip@physics.ucdavis.edu   
      
   On 5/16/23 12:24 AM, Richard Livingston wrote:   
   > Recently I've been thinking about planetary aberration.  This is the   
   > effect where the finite speed of light causes an orbiting body to see   
   > the opposite body on its past light cone, and thus displaced from its   
   > "now" position directly opposite the center of gravity.  The problem is   
   > that if the body it attracted directly towards this displaced position,   
   > there is a torque on the system that would cause it to speed up.   
   >   
   > This clearly does not happen.  A quick calculation for the earth-sun   
   > system shows that the angular momentum would double in about 800 years,   
   > which clearly has not been happening.   
   >   
   > My question for this group is why not?   
      
   I've done the calculation, for both electromagnetism and GR,   
   in detail, in https://arxiv.org/abs/gr-qc/9909087.   
      
   Steve Carlip   
      
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