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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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