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    Re: Wright's 1599 Chart showing Scillies
    From: George Huxtable
    Date: 2007 Nov 29, 23:33 -0000

    Gary LaPook wrote, referring to Wright's longitudes for his zero meridian,
    Cape Verde or the Cape Verde islands
    
    This brings up the question of how were these longitudes determined by
    Wright. If only by dead reckoning then it is truly amazing how
    accurately they were determined. Anybody have any information about this?
    
    Here, I am only guessing. All I have about Wright is what David Waters has
    to say, in "The art of navigation in England in Elizabethan and early
    Stuart.times" (1958). By the way, in plate 58, he shows the same chart of
    the NE Atlantic as Gary has done.
    
    Waters doesn't seem to say anything about his longitudes. But as I see it,
    the best way of getting longitude, at Wright's date of 1599, would be to
    find the local time of an eclipse of the Moon, a method which went right
    back to Ptolemy. At night, my guess is that the local time could be
    estimated using a nocturnal, based on the angle that the two guide-stars,
    "The Guards", make with the horizon. It would be best if the same eclipse
    had been observed back home, but otherwise, it would have to rely on
    predictions. I doubt if any longitude could be determined to better than a
    degree or two that way, but even so, that would be better than dead
    reckoning.
    
    George.
    
    contact George Huxtable at george---.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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