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    Re: venus
    From: Herbert Prinz
    Date: 2004 Oct 16, 21:11 -0400

    Oops, George, your formula is right. What a comedy of errors.
    
    I am sorry for sending you on a wild goose chase. Your formula didn't seem to
    square with one I had which  gives topocentric zenith distance form geocentric:
    
           tan zeta' = (sin zeta / (cos zeta - R/D))
    
    R = Earth radius, D = distance of object.
    
    But the formulas ARE equivalent. I made the same error twice when working mine
    into the shape of yours.
    
    Frank, thanks for checking. Maybe you overlooked that George works with
    altitudes?
    
    Herbert Prinz
    
    
    

       
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