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    Re: Finding longitude in the 12th century
    From: Alexandre Eremenko
    Date: 2012 Sep 1, 21:09 -0400

    Dear Lu,
    
    > Yes, Barentz did do an excellent job of determining his longitude, as you
    > noted.
    
    I have noted just the oposite. The error 9 degrees is a very poor job,
    and useless for navigation.
    It is 9 DEGREES, not minutes!
    My point was that EVEN in XVI century one could NOT determine
    longitude.
    
    
    >�But what post 12th century knowledge was required to do that?
    
    Not much.
    The first serious progress on the Moon was due to Tiho Brahe.
    This was somewhat before Barentsz but I dount that Barentsz could use
    this progress because the tables based on Tycho's discoveries had not
    been published yet.
    
    Alex.
    
    
    
    
    

       
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