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    Re: N.A. Altitude Correction Table
    From: Bill Murdoch
    Date: 2001 Apr 27, 3:32 PM

    Speaking of the sun: Has anybody on the list observed it in the last few
    
    
    Wow.  No wonder the short-wave radio works so well.
    
    In "Explanatory Supplement to the Astronomical Almanac" (ISBN 0-935702-68-7)
    on pages 140-145 are several formulae for the refraction correction including
    the one in the N.A.  The "Astronomical Almanac" also has a couple of formulae
    on page B62 (in the latest copy I have, 1994).  I have never been able to
    match the tables exactly, but it is after all measured data and has real and
    significant variation.
    
    Bill Murdoch
    

       
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