From: PointedEars@web.de   
      
   Thomas 'PointedEars' Lahn wrote:   
   > According to the Einstein equivalence principle it is not possible to   
   > distinguish, without external reference, free fall in a uniform   
   > gravitational field from a state of rest not under the influence of   
   > gravitation, or motion in an accelerated reference frame not under   
   > the influence of gravitation from motion in a frame at rest under   
   > the influence of uniform gravitation.   
   >   
   > So it is not correct to say "acceleration is absolute".   
      
   IOW, acceleration (gravitational or not) can be made to *disappear* by   
   a coordinate transformation to an accelerated reference frame.  So it   
   *depends* on the *choice* of reference frame: it is NOT absolute.   
      
   --   
   PointedEars   
      
   Twitter: @PointedEars2   
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