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    Re: Almanacs, theory and use.
    From: Paul Hirose
    Date: 2007 Nov 20, 12:04 -0800

    Basically, the figures tabulated in the Nautical Almanac are the
    *geocentric* positions of celestial bodies, i.e., their positions as
    seen by an imaginary observer at the center of a transparent Earth.
    Calculating their positions for a particular place requires another
    book: a "sight reduction" table.
    A detailed description of the nautical almanac can be found in "The
    American Practical Navigator". The book is usually just called
    "Bowditch", after the name of the original author. Take a look at
    chapters 19 and 20 in the online version:
    Chapter 19 is devoted to almanacs, but to see images of actual almanac
    pages you have to look in chapter 20!
    Note that Bowditch is a reference manual, not a textbook, so for a
    novice it can be overwhelming. It's not the easiest way to learn
    celestial nav.
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