XPost: rec.arts.tv, alt.fan.rush-limbaugh   
   From: relativity@paulba.no   
      
   Den 01.11.2025 13:43, skrev J. J. Lodder:   
   > Paul.B.Andersen  wrote:   
   >   
   >> Den 31.10.2025 13:21, skrev Maciej Wo?niak:   
   >>>   
   >>> GPS clocks are adjusted down by (1 - 4.4647e-10)   
   >>> so the adjusted clock will measure a mean solar day   
   >>> to last 86400 s, and the clock will stay in sync with UTC.   
   >>   
   >> Right.   
   >>   
   >>>   
   >>> I.e. where The Shit is predicting the measurement   
   >>> result of 86400s+37(afair)us, the real measurement   
   >>> result is 86400, with the precision of an acceptable   
   >>> error. Common sense has been warning your idiot guru.   
   >>   
   >> Lets take this one step at the time:   
   >>   
   >> 1. A clock on the ground which is running according to   
   >>      the SI definition will measure a mean solar day to   
   >>      last 86400 s.   
   >>   
   >> 2. SR predicts that a clock in GPS orbit which is running   
   >>      according to the SI definition will measure a mean solar   
   >>      day to last 86400?(1 + 4.4647e-10) s ≈ 86400s + 38.6 ?s   
   >>   
   >> 3. When a clock in GPS orbit is adjusted to run slow   
   >>      by the factor (1 - 4.4647e-10) compared to the SI-definition,   
   >>      then the clock will measure a mean solar day to last 86400 s.   
   >>   
   >> Please explain why the real measurement in 3.   
   >> do not confirm SR's prediction in 2.   
   >   
   > You shouldn't allow yourself to be dragged   
   > into this 'mean solar day' nonsense.   
   > There is no way that a 'mean solar day' can be measured   
   > to anything like the accuracy of an atomic clock.   
   > That is precisely the reason why the astronomical definition of the   
   > second was given up, long ago.   
      
   This 'discussion' is with Maciej Woźniak.   
   The only kind of second he knows is 1/86400 part of a mean solar day.   
   > So the 'mean solar day' is by definition nothing but   
   > 86400 SI secondo. (of proper time)   
      
   You have to add: measured by a clock on the geoid.   
      
   This is the very point!   
   My point 1. above is:   
      A 'mean solar day' is 86400 SI seconds measured by   
      a clock on the ground.   
   My point 2. is:   
      A 'mean solar day' is 86400(1 + 4.4647e-10) SI seconds   
      measured by a clock in GPS orbit.   
      
   To a knowledgeable person like you would have expressed   
   this something like this:   
      
   The orbital time of a GPS satellite is half a sidereal day,   
   or 43082.04525 UTC seconds (measured on the geoid).   
      
   The orbital time of a GPS satellite measured by a clock in   
   the satellite is 43082.04525(1 + 4.4647e-10) SI seconds.   
      
   > And of course 86401 seconds, once in every three years or so.   
   > The 'mean' can be left off.   
   >   
   > What is really mesured these days   
   > is the actual orientation in space of the Earth.   
   > We have the IERS to keep track of that,   
   > nearly instantaneously, to centimeter accuracy.   
   >   
   > Jan   
   >   
   >   
   >   
   >   
   >   
      
      
   --   
   Paul   
      
   https://paulba.no/   
      
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