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    Re: Sunrise
    From: Bill Murdoch
    Date: 1999 Apr 25, 7:09 PM

    You might want to take a look in P. Kenneth Seidelmann, "Explanatory
    Supplement to the Astronomical Almanac", ISBN 0-935702-68-7.  Pages 141-145
    are a discussion of atmospheric refraction.  The references at the end of
    chapter 3 contain a number of leads for other refraction articles.  Pages
    483-489 give a method of calculating sunrise and sunset.  Section 9.331 is
    titled The Effects of Dip and Refraction.
    In "The Nature of Light and Color in the Open Air" (ISBN 0-486-20196-1), M.
    Minnaert says that the green ray can also be seen at sunrise (page 62).  He
    uses that as a proof that the green ray is real and not just an afterimage of
    the bright sun.
    Bill Murdoch

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