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    Re: sunrise/set and twilight calc.
    From: John Simmonds
    Date: 1997 Feb 11, 11:14 EST

    On Mon, 10 Feb 1997 10:11:00 -0600, Pickering, Keith (c) wrote:
    >Check out:
    >
    >Astronomical Formulae for the Calculator
    >by Peter Duffet-Smith
    >
    >Cambridge University Press, 1989(?)
    >
    >Designed primarily for the amateur astronomer, but full of useful stuff
    >for navigators, too.
    >
    Even better, 'Astronomical Formulae for Calculators' by Jean Meeus
    and published by Willman-Bell in Richmond, Viginia
    Cheers,
    John
    =====================================
    He who has never been lost is no navigator
    =====================================
    

       
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