Re: Motion Through Space Is Meaningful

2ndPostulateDude wrote: 
Sam Wormley wrote:

2ndPostulateDude wrote: 

        -snip-

Dirk and Sam should consider the following:
In order for any SR prediction is to be useful to
physics, it must be based upon the use of valid
experimental equipment; however, no one has proved
that SR's clocks are (1) correctly related temporally,
or (2) not physically slowed, and no one has proved
that SR's rulers are not physically contracted.



Dude should purchase a Global Positioning System
receiver, enter in the coordinates of the local
particle accelerator, and use the GPSR to get
himself there. SR in action!



Are you claiming that the GPS clocks are absolutely
synchronous? If so, then tell us how that came to be.


  No--The clocks are separated. GPS does, however, currently make
  us of a dozen relativistic corrections to help attain the
  accuracy that it enjoys.




Einstein claims that we cannot have absolute time, so
absolute synchronization in GPS would contradict, not
support, SR.


  That is correct, no absolute time, no absolute synchronization.


The GPS does not need absolute synchronization because it
uses geometrical corrections:

WEB REF.:
"That's the idea behind differential GPS: We have one
receiver measure the timing errors and then provide
correction information to the other receivers that are
roving around. That way virtually all errors can be
eliminated from the system, even the pesky Selective
Availability error that the DoD puts in on purpose."
                http://www.trimble.com/gps/


  This is, in general correct, however Selective Availability was
  done away with by Bill Clinton... Where have you been?

  Back to the subject at hand. There has *never* been a prediction
  of Special Relativity that was contradicted by an observation.
  *Never*.  Many predictions of Special Relativity are demonstrated
  in particle accelerators and the Global Positioning System...
  Absolute synchronization is *not* a prediction!
.

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