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    Re: How good were chronometers?
    From: Ken Muldrew
    Date: 2006 Mar 15, 09:03 -0700

    On 15 Mar 2006 at 8:38, cfi@licfi.com wrote:
    
    > Frank,
    >   You wrote:
    >
    >     > Stars, including Polaris, were  rarely used in celestial navigation >
    >     before the 20th century except occasionally  for lunar distance
    > sights.
    >
    > I seem to recall reading in a number of places that they were especialy on
    > land. Hard to say what is right when you here so many different things!
    
    The fur trade navigators in North America used stars extensively for
    lunars in the late 18th and early 19th centuries. There may be several
    reasons for this. It would be inconvenient to stop the brigade for
    observations (even the noon sight is not done that regularly), using stars
    would allow a time sight that used a star that was rising or setting (they
    always take a time sight just before or after their lunar), in the
    Northern winter the opportunities for star-lunars are better and more
    frequent, probably there are other reasons as well that don't come to mind
    at the moment.
       \----------------------------+---------------------------------+   o_,
     O_/ \    Ken Muldrew, PhD      | Voice: (403) 220-5976           |
    <\__/7
     <\__  \  Dept. of Cell Biology | Fax:   (403) 270-0617           |     |
    /
      "\ L  | University of Calgary | kmuldrew@acs.ucalgary.ca        |   / /
       <    +-----------------------+---------------------------------+ / /
                   Morning coffee recapitulate phylogeny               L/
    
    
    

       
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