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From: Jeff-Relf.Me  @.
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Newsgroups: sci.physics,comp.os.linux.advocacy,rec.arts.sf.written,sci.physics.relativity,alt.astronomy
Subject: GPS satellites.
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> > GPS satellites are the perfect way to explain relativity,
> > because everyone can relate to it.
> > 
> > On Earth, the satellite's signal is BlueShifted by gravity
> > and RedShifted by its velocity, relative to earth's core.
> 
> While that is true, the relativistic correction in GPS satellites
> is in the timebase, not the transmission frequency.

Relativity is used to adjust the frequency of the orbiting clocks;
c, the speed of light, is a known constant;
so time and distance are easily derived.