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    Re: In Honor Of Jeremy Two Stars Full Lan's : One Upper And One Lower Culmination
    From: George Huxtable
    Date: 2009 Sep 21, 18:30 +0100

    Antoine's observations are of much interest, from the celestial nav.
    viewpoint.
    
    But I'm also intrigued by some of the other details he quotes.
    
    Particularly, I'm astounded by his mention of a current of as much as 2.5
    knots, out in the deep South Atlantic Ocean, between South Georgia and
    Tristan. That's the sort of current you might expect in constricted waters,
    such as off-Florida, or in strongly tidal waters. Was that value derived
    from predictions in Ocean Current Charts? If so, what was the source? Or
    would local current have been deduced on-board, perhaps, from divergence
    between measured speed through the water and speed found astronomically.
    Anyway, that 2.5 knots seems worth questioning. The direction given is as
    expected.
    
    The other question is about the vessel herelf, and her voyage. With a
    height-of-eye of 25ft, she doesn't seem very large, though reasonably fast
    (18 knots). It looks very much as if she must have rounded Cape Horn, and on
    her way to pass South around South Africa.  Just a bit unexpected, if she
    was a French vessel. Would Antoine care to enlighten our curiosity?
    
    George.
    
    contact George Huxtable, at  george{at}hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
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