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    Re: Halley's lunars, back in 1698-1700
    From: Wolfgang K�berer
    Date: 2004 May 6, 20:26 +0200

    Dear George,
    let me add some historical detail to your post about Halley:
    He wasn`t the first one to propose finding longitude by magnetic variation,
    of course. Notable precursors were Simon Stevin in his "Haven-Finding Art"
    (London 1599; reprinted Amsterdam/New York 1968) and Guillaume de Nautonnier
    "M?cometrie de Leymant" (Venes 1603). There is a complete refutation of the
    latter`s theory in the second edition of Edward Wright "Certaine errors in
    navigation detected and corrected..."(London 1610), the work that laid the
    mathematical foundations of the Mercator projection.
    More detail on the efforts of finding longitude by variation can be found in
    D.W. Waters "Art of Navigation in England in Elizabethan and Early Stuart
    Times" (London 1958) and of course in "The Quest for Longitude". A.R.T.
    Jonkers "Earth?s Magnetism in the Age of Sail" (Baltimore/London 2003), a
    condensation of his dissertation - which is a mine of information concerning
    magnetism, compasses and navigation - gives more information on the
    Life member of
    TINSTAARG (There is no such thing as a responsible gun)
    TOTTCHAIAUITPOBIAGW (The only thing that Charlton Heston and I agree upon is
    that Patrick O`Brian is a great writer)
    CSSTHOBIEMAATNCTKA (Can`t somebody stop this habit of broadcasting in
    e-mails memberships and allegiances that nobody cares to know about)

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