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    Re: Refraction at the horizon.
    From: Marcel Tschudin
    Date: 2008 Mar 18, 12:50 +0200

    ... after some further thoughts ...
    
    (1) I investigated some time ago how the refraction at large zenith
    distance depend on changes in temperature and pressure at the observer
    and found  at that time that those dependencies are quite exponential.
    
    (2) It could also be that this low refraction is caused by the
    transition at the upper level of the boundary layer which is likely to
    be  in this case below the observer.
    
    Marcel
    
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