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    Re: Refraction at the horizon
    From: Marcel Tschudin
    Date: 2008 Mar 17, 19:42 +0200

    >  This paper can be downloaded as pdf-file from here
    >  http://adsabs.harvard.edu/abs/2000AJ....119.2472A
    
    Sorry, I realise only now that the paper can also be downloaded from
    the link which Andr�s provided.
    
    H o w e v e r ,
    for all of you who are interested in setting up their own program for
    calculating refraction on self-defined atmospheric profiles and using
    the very efficient Auer-Standish-Procedure I recommend to obtain the
    following paper:
    
    C. Y. Hohenkerk and A.T. Sinclair, The Computation of Angular
    Atmospheric Refraction at Large Zenith Angles, NAO Technical Note No.
    63, April 1985
    I can imagine that Catherine Hohenkerk will be pleased to send you the
    paper as pdf-file if you ask her by mail:
    Catherine.Hohenkerk a t UKHO.gov.uk
    
    The paper contains more detailed explanations of the procedure than
    the original Auer-Standish paper. In addition it provides the source
    code (in fortran) for calculating refraction with a simple atmospheric
    model (troposphere and stratosphere) with the observer at sea level.
    It obviously still needs quite a bit of work to adapt this program to
    calculate multilayer atmospheres and also allowing for an observer
    being above sea level looking down  to the horizon or to make it even
    capable of handling ducts. I recommend this paper; it is really a good
    starting point for such a project.
    
    Marcel
    
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