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Old January 30th 08 posted to sci.physics.relativity
Jeckyl
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Posts: 8,421
Default GPS CLOCK PARADOX

"snapdragon31" wrote in message
...
On Jan 29, 8:54 pm, Randy Poe wrote:
On Jan 29, 8:14 pm, HW@....(Dr. Henri Wilson) wrote:

According to relativists, GPS clocks GAIN 38us per day on the ground
clock.
That is due to two components, 45us for gravity and -7us for relative
speed.


Accordingly, an observer (OO) in GPS orbit would see the GC LOSING 52us
per
day.


After one year, the OO would calculate that the OC was about 19ms ahead
of the
GC.
However, the GO would calculate that his GC was only 13ms behind.


What happens when the clocks are reunited?
Who is right?


Two people drive different routes from city A to
city B. When they are reunited, one odometer reads
220 km and the other reads 230 km. Which one is
right?

According to relativity, both odometer readings are wrong. They do
not represent the true distance of the routes travelled because of the
length contraction effect.


It was an anlogy only .. derr .. to illustrate that taking different paths
in space gives you different elapsed distances .. and that similarly
different paths in space time can give you different elapsed times. And
there is no such thing as 'true distance' in any case.

According to Newton's law, both odometer readings are right.


Just as in SR, both clocks are right in the so-called twins paradox. They
are simply measuring different quantities.

The GPS clock paradox is a variation of the twin paradox, so no valid
solution.


Why not .. the so-called twins paradox is well explained by relativity by a
number of methods (all giving the same results) .. why do you think there is
no 'solution'? Why do you even think there is something there that needs
solving?


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