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Hey, great going. Looks like with Weems' sec/csc tables in The Secant Time 
Sight book (Public Domain, according to Google Books site) and the formulas 
in the lower right of figure 1 you have what you need to compute an LOP.

Also looks like the formulas should be easy to restate into cos/sin for slide 
rules. Will check this out later.

Hewitt

Sent from my iPad

On Dec 17, 2012, at 12:40 AM, "Gary LaPook"  wrote:

> 
> See attached.
> 
> gl
> --- On Sun, 12/16/12, John Brown  wrote:
> 
> From: John Brown 
> Subject: [NavList] Re: Precomp Navigation
> To: NavList---org
> Date: Sunday, December 16, 2012, 2:52 PM
> 
> From Richard Langley:Table of contents:
> http://www.ion.org/publications/toc/celnavTOC.pdf
> Apparently still available for $50. (towards the bottom):
> http://www.ion.org/shopping/begin.cfmHello RichardOnly 18 cents per paper!  
Makes the $13.50 just for Precomp look somewhat expensive.I don't remember 
where I got my copy from - perhaps through the RIN, and I'm sure it wasn't 
$50 at the time.John
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> Attached File: http://fer3.com/arc/img/121454.precomp_0001.jpg
> 
> Attached File: http://fer3.com/arc/img/121454.precomp_0002.jpg
> 
> Attached File: http://fer3.com/arc/img/121454.precomp_0003.jpg
> 
> Attached File: http://fer3.com/arc/img/121454.precomp_0004.jpg
> 
> 
> : http://fer3.com/arc/m2.aspx?i=121454
> 
> 

   

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