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    Re: Mid XIX century Nav
    From: Frank Reed CT
    Date: 2005 Nov 22, 01:10 EST

    Heny H you wrote:
    "Malham's 1795 Gazetteer  lists a "Nangansaqui" in Lat 32-31 N + Long
    128-48 E, and further identifies  Dutch Factors as resident on a nearby
    island of Disnia"
    Ah yes, the  famous Japanese DisniaLand...  
    And also:
    "Nevertheless,  as I briefly posted previously, conventional wisdom would
    require knowledge  of Longitude for the rating of chronometers by the
    usual methods available to  seamen. Obviously, there was some early on
    knowledge of Longitude on the  coasts of Japan - probably established by
    the Dutch traders."
    Of  course if the assumed longitude is somewhat incorrect, you can still get
    the  rate by calculating the error on trials a few days apart. A reliable
    chronometer  rate, even with an originally incorrect value for the chronometer
    error, would  still be useful so long as the error is not too large.
    42.0N  87.7W, or 41.4N 72.1W.

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