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    Re: Calculators...it is a shame the moon's motion is so complicated
    From: Gene W
    Date: 1999 Sep 03, 5:01 AM

    >But, the sun is also the most useful body.   You may need no more.  (It is a
    >shame the moon's motion is so complicated.  It woudl be a good second body.)
    >
    >Bill Murdoch
    
    Hi Bill
    
    Check out this book. You may find it interesting.
    
    Regards
    
    Gene Wunderlin
    -----------------------------------------------
    
    TABLES FOR CLEARING THE LUNAR DISTANCE
    by Bruce Stark
    
    Think of the satisfaction of aiming your sextant at the moon and
    determining time
    (GMT) accurately! You can do this anywhere- at sea, in the mountains-
    no natural or
    artificial horizon is needed. This is the old method of "lunars"
    which was used by
    mariners (and explorers) to reset their clocks almost until the
    beginning of the 20th
    century.
    
    Because the moon moves much slower across the sky than the stars, its changing
    position can be used in sort of a reverse process of sight reduction
    to find the time. The Nautical Almanac no longer has tables of
    precomputations for finding the time based on the distance between
    the moon and certain selected stars as it once did. Instead, this
    book can be used with the modern Nautical Almanac to find the time in
    this way with quick and easy computations. That is not to say,
    however, that making the observations are so easy. The practicing
    navigator will appreciate the opportunity to use the sextant in this
    additional way, and the challenge it presents. Even amateur
    astronomers may enjoy this interesting pursuit.
    
    The present justification for celestial navigation is that it
    provides a backup when
    electronics fail. Since electromagnetic shock from a nearby
    lightening strike can derange timekeepers as well as electronics, the
    celestial solution which includes "lunars" becomes even more powerful.
    
    This book includes a motivating preface, and complete instructions on
    its use, as well
    as coaching on the observations themselves. SoftCover, 8.5x11 inches
    spiral bound, 301 pages, 1997. SW 2.5 lbs.
    
    http://celestaire.com
    

       
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