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    Fw: Letcher page 103
    From: Greg Rudzinski
    Date: 2010 Feb 10, 12:43 -0800

    
    --- On Wed, 2/10/10, Greg Rudzinski  wrote:
    
    > From: Greg Rudzinski 
    > Subject: Letcher page 103
    > To: hannoix@sbcglobal.net
    > Date: Wednesday, February 10, 2010, 10:56 AM
    > Hanno,
    > 
    > Thanks for the forwarded web book by Letcher. Page 103 has
    > a most clever way to check a chronometer at sea. When doing
    > the Dreisonstok method I only solve for Hc then use a
    > standard 10" K&E slide rule to solve for azimuth using
    > the formula cos dec x sin meridian angle / cos Hc.
    > 
    > Greg
    > 
    > 
    > � � � 
    > 
    
    
    
    
    
    
    

       
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