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    Re: Sobel and Longitude. was:: Re: David Thomson and his lunar tables
    From: Ken Muldrew
    Date: 2010 Mar 19, 09:40 -0600

    On 18 Mar 2010 at 23:38, George Huxtable wrote:
    >  But in the
    > lunar era, a conscientious navigator would take a lunar when
    > the opportunity arose, when the Moon was visible in a clear sky. It was
    > part of the "professional pride" that Henry has referred to.
    Do you have any historical evidence to support this claim? Although
    instructors of navigation may have wished for such zeal in their students,
    without historical evidence, such as logbooks, one should be skeptical.
    The logbooks that Frank has studied, and written about here, provide a
    different view of how navigators depended on lunars in that era. It may be
    that his sources (primarily American whalers) have a bias toward a certain
    type of navigator, but anyone proposing that hypothesis is obligated to
    provide some evidence to support it. Frank's historical evidence from
    primary sources has to be considered a trump card in this debate until
    such time as other sources can be shown to contradict, or at least temper,
    his conclusions.
    Ken Muldrew.

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