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    Re: Douwes
    From: Wolfgang K�berer
    Date: 2009 Sep 26, 14:48 +0200

    Nicol�s de Hilster has already pointed out the basic information about
    Cornelis Douwes.
    
    Anybody who wants to know more should consult Ernst Crone's book "Cornelis
    Douwes, 1712 - 1773. Zijn leven en zijn werk, met inleidende hoofdstukken
    over navigatie en zeevaart-onderwijs in de 17de en 18de eeuw", Haarlem 1941.
    With luck you might find a copy on the internet.
    
    I would also like to add that Douwes was not the first person to describe a
    method of finding latitude by two ex-meridian sun shots (or any two
    observations of a celestial object). The history of this navigational
    problem (going back to Regiomontan and Pedro Nunes) is presented in an
    article by G.D.E. Weyer, "Die direkten oder strengen Aufl�sungen f�r die
    Bestimmung des Beobachtungsortes aus zwei H�hen der Sonne oder anderer
    bekannten Gestirne nebst dem Zeitunterschiede der Beobachtungen", in:
    Annalen der Hydrographie und maritimen Meteorologie, Jg. 11 (1883), 69 - 85,
    148 - 163, 209 - 226, 262.
    
    Regards,
    Wolfgang
    
    
    
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