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    Re: Tides by bearing of the moon
    From: Brad Morris
    Date: 2009 Apr 7, 09:35 -0400

    I found it as well in Bowditch, 1849.  Being the curious type, I went through 
    the exercise of calculating the time of high tide for my location.  Needless 
    to say, it did not yield a correct answer.  I recall that it was off by 
    hours.  Not even close to a correct answer.
    
    This is probably the reason it was dropped.  Just useless in practice.
    
    Best Regards
    Brad
    
    
    -----Original Message-----
    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Wolfgang K�berer
    Sent: Tuesday, April 07, 2009 2:04 AM
    To: NavList@fer3.com
    Subject: [NavList 7864] AW: [NavList 7862] Tides by bearing of the moon
    
    
    This is the oldest method of determining the time of High (and Low) Tide; it
    was in use at least since the 15th century. One can find descriptions in the
    "Quatri Partitu" of Alonso de Chaves (ca. 1545) and in English in two
    versions of Chaucer's treatise on the astrolabe (which may be later
    additions), not to forget the French booklets by Guillaume Brouscon. A table
    giving the moon's bearings for the main ports at high and low tide was
    included in practically every textbook on navigation well into the 19th
    century.
    If you want to read more about it, see: Howse, Some Early Tidal Diagrams,
    in: Mariner's Mirror, Vol. 79 (1993), 27 - 43. The booklets by Brouscon are
    dealt with by Dujardin - Troadec, Les Cartographes Bretons du Conquet. La
    Navigation en Images 1543 - 1650, Brest 1966.
    
    Regards, Wolfgang
    
    
    
    
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