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    Re: Problem with a sextant
    From: Alexandre Eremenko
    Date: 2006 Apr 25, 08:38 -0400

    On Tue, 25 Apr 2006, Peter Fogg wrote:
    > I've had zero intercepts with
    > sights made on land, meaning that the error was less than the resolving
    > power of my method
    I also had zero intercepts with the same sextant.
    And not only with Sun but also with the Lunars.
    But let me cite William Wales, Cooke's companion:
    "It must be owned there is yet something
    in the constitution of this Quadrant very disagreable,
    and not easily to be accounted for. Sometimes, many months
    together, the longitudes deduced from observations made about the same
    time with my two sextants would not differ more than 10
    or 15 miles, and very seldom so much; after which
    the longitudes, so deduced, would begin to differ, and the difference
    would gradually increase, sometimes more than a degree and an half:
    In little time it would again decrease, and soon after the observations
    would agree as well as ever.
    It will be readily supposed, that no means were left untried by me
    to discover the ause of this strange aberration; but all
    my endeavours were ineffectual;
    and I mention the circumstance to induce some person,
    more skilful in mechanics, to attempt it".
    As we see, my problem is not new:-)

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