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    Formula for refraction
    From: Alexandre Eremenko
    Date: 2007 Mar 20, 15:53 -0700

    What is the exact formula for refraction (for stars)
    used in the Almanac?
    The formula given in Meeus does not match the
    almanac table sometimes by more than 0'1.
    Meeus's formula is certainly approximate (and he says so)
    but it does not match the almanac table with the precision
    Meeus claims.
    Chuvenet has complete theory but no useful simple formula.
    My question is practical: I want to incorporate automatic refraction
    computation in my spreadsheet for star distances.
    Alex.
    
    
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