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    Re: Lunar eclipses and other things
    From: Wolfgang K�berer
    Date: 2004 Oct 28, 09:07 +0200

    Dear Alex,
    I always thought that the armillary sphere is a model of the Ptolemaic
    system; its only use was to demonstrate the celestial spheres and the
    "workings of the heavens". That seems to be a somewhat different task than
    that of a star globe. But correct me if I`m wrong.
    Regarding modern analogue devices you can turn to the 70`s edition of
    Bowditch which has a chapter on "Comparison of the different methods of
    Sight Reduction" and also discusses such machines. Willem M?rzer Bruyns, the
    former curator of the Nederlands Scheepvaart Museum at Amsterdam has
    published the following article on one of the analogue computers:
    The Willis Navigating Machine: A Forgotten Invention, in: Rittenhouse, Vol.
    14 (2000), No. 51, 13 - 25.
    Regards, W. K?berer

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