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    Re: Refraction at the horizon.
    From: James R. Van Zandt
    Date: 2008 Mar 14, 01:21 +0000

    > This situation shows that
    > apparently no one was really interested in finding out how the
    > refraction near the horizon could be better predicted.
    > >  | Of course, navigators at
    > >  | sea do not generally have access to current atmospheric temperature
    > >  | profiles. Some naval navigators might have been able to observe the real
    > >  | temperature profile (by launching balloons or even aircraft), but the
    > >  | computing power to generate refraction tables "on the fly" probably arrived
    > >  | too late for naval celestial navigation.
    
    Refraction affects radar too, and that community is *very* interested in 
    observations near the horizon.  The authoritative information may not be 
    widely published, though.
    
                 - Jim Van Zandt
    
    
    
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