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    Re: Advancing position circles: Huxtable vs. Zevering
    From: George Huxtable
    Date: 2006 Sep 21, 04:28 -0500

    Thanks to Philip Bailey for his account of the recent correspondence
    in Journal of Navigation. I found the Zevering reponse just as
    confusing, and confused, as he did; but then I would be biased in that
    direction, wouldn't I?

    It strikes me that perhaps NavList members might like to tackle the
    simple test-problem that I set, as follows-

    1. An observer, at position P1, measures the altitude of a star S1, at
    (Dec1 = 0, SHA1 = 0), to be 30 degrees.

    2. Then he travels due North by 60 nautical miles (= 1 degree), to P2.

    3.. From there, he observes another star S2 (then at Dec2 = N 1
    degree, SHA2 = W 45 degrees) to be at an altitude of 45 degrees. Where
    on Earth is he then?

    and concluded-

    "I challenge Zevering to apply his procedure to the problem as set out
    above, to provide us with initial and final positions for the
    observer, the initial altitude of star S1, and the final altitude of
    star S2."

    In his reply, Herman Zevering has not responded to that challenge,
    from which NavList members may draw their own conclusions.

    But what solutions do NavList members arrive at, I wonder, if they
    pick up that same challenge, using any method they think appropriate?


    contact George Huxtable at george@huxtable.u-net.com
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.

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