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    Re: Refraction
    From: Dave Walden
    Date: 2008 Jul 4, 09:10 -0700

    There IS one absoulutely correct result for refraction...the giant
    analog computer over our heads.  And its fast.  Unfortunaltely, it
    ONLY runs real time.
    
    I used the star link  R F R O subroutine by Wallace (head of the UK
    Natu Alm Office.
    ( It reproduces the critical table in the Naut Alm exactly.)
    
    
    
    *  P.T.Wallace   Starlink   3 June 1997
    *     The routine computes the refraction for zenith distances up
    *     to and a little beyond 90 deg using the method of Hohenkerk
    *     and Sinclair (NAO Technical Notes 59 and 63, subsequently
    adopted
    *     in the Explanatory Supplement, 1992 edition - see section
    3.281).
    
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