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From: karsh@geowhiz.UUCP (Bruce Karsh)
Newsgroups: net.physics
Subject: Re: Experimental verification of General Relativity
Message-ID: <167@geowhiz.UUCP>
Date: Fri, 22-Mar-85 00:02:32 EST
Article-I.D.: geowhiz.167
Posted: Fri Mar 22 00:02:32 1985
Date-Received: Tue, 26-Mar-85 04:59:59 EST
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Organization: UW Madison, Geology Dept.
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  I did not see the original posting of this Subject, but I assume
that it asked about experimental verification of *General* relativity.  

  It is interesting that there is now at least one engineering aplication
of GR.  The GPS sattelite system, which provides ultra accurate position
and time signals for navigational and timing purposes, requires GR
corrections in order to work.

  The article that I read about this in is:

                 Microwave Systems News
                 Volume 14, Number 12
                 November 1984

  The part about GR is on page 75 of the article.

  According to the article, the result of not including the relativistic
corrections would be an error of 11 km/day.  The system with the correction
is good to a few meters with no accumulated error.

  The article states that GPS is a continual application and demonstration
of the Theory of Relativity.


-- 
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