From: nospam@de-ster.demon.nl   
      
   Paul B. Andersen  wrote:   
      
   > Den 19.02.2026 20:00, skrev amirjf nin:   
   > > Has anyone tried Michelson-Morley-type experiments with the ECI in mind?   
   >   
   > If you by "the ECI" mean "the non-rotating frame of reference   
   > where the centre of the Earth is stationary", this was very much   
   > in Michelson's mind.   
   > He tried to measure the speed of the ether in said frame.   
   >   
   > In Michelson's words:"the motion of the earth through the ether".   
   >   
   > https://paulba.no/paper/Michelson_1887.pdf   
      
   But Michelson was well aware that there should be both a daily effect,   
   caused by the Earth' rotation, and a (much larger) yearly effect   
   caused by its orbital motion.   
      
   IIRC he looked for both, so he 'didn't think ECI',   
   (avant la lettre)   
      
   Jan   
      
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