From: PointedEars@web.de   
      
   Ross Finlayson wrote:   
   > On 02/12/2026 06:28 AM, Thomas 'PointedEars' Lahn wrote:   
   >> Thomas 'PointedEars' Lahn wrote:   
   >>> Ross Finlayson wrote:   
   >>>> Actually, a photon follows about _half_ the curvature of   
   >>>> spacetime,   
   >>>   
   >>> No, you are confusing facts.  The "half" comes from that the angle of   
   >>> deflection of light as observed, and as predicted by general relativity, is   
   >>> only half of the angle as predicted by Newtonian mechanics *if* one assumes   
   >>> that a photon has a non-zero mass that is equivalent to its energy.   
   >>   
   >> [I always seem to confuse this when I explain it :'-)]   
   >>   
   >> The correct, observed value is *twice* as large as calculated using Newton's   
   >> theory and assumptions for the mass of a photon (so the Newtonian value is   
   >> only half the correct value, not the other way around).   
   >   
   > It's of note that seemingly-capricious factors of   
   > the "doubling" and the "halving" show up in quite   
   > a number of formulaic accounts that don't have   
   > mathematical justifications themselves except that   
   > in the limit (toward zero) they're the negligeable,   
   > and that the eventual empirical result was off   
   > by a factor of two. I.e., it's an arbitrary constant.   
      
   Nonsense.   
      
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   PointedEars   
      
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