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    Re: Q: how to calculate refraction at higher altitudes onland?
    From: Victor Reijs
    Date: 2002 Feb 28, 16:32 +0000

    Hello Dan,
    
    Beside the refraction (and I have the idea that your deductions are
    correct), you still have the horizon dip, which is dependent on the
    altitude. So keep that in mind. See also my web pages to calculate these
    things:
    http://www.iol.ie/~geniet/eng/refract.htm
    
    All the best,
    
    
    Victor
    
    Dan Allen wrote:
    
    > My guess is that if refraction is stricly due to atmospheric thickness, the 
    barometric pressure is sufficient, but if there are
    > geometrical aspects to refraction (which I know there are since there is no 
    refraction for a body directly overhead), then elevation
    > much above sea level needs to be accounted for separately from barometric 
    pressure.  The question then is, by how much?
    
    --
    URLs: http://www.iol.ie/~geniet
          http://www.iol.ie/~geniet/eng/archaeocosmology.htm
          http://www.iol.ie/~geniet/maeshowe
          http://www.iol.ie/~geniet/setrise
          http://www.iol.ie/~geniet/irishstones
          http://www.iol.ie/~geniet/stpatrick
    
    
    

       
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