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The problem is that the standard (25 cm) slide rule hardly gives the third digit reliably.
As we usually do computation with one more digit than absolutely necessary,
for practical purposes, the standard rule gives only 2.



Alex.
________________________________________
From: NavList@fer3.com [NavList@fer3.com] on behalf of Frank Reed [NoReply_FrankReed@fer3.com]
Sent: Sunday, January 03, 2016 3:14 PM
To: eremenko@math.purdue.edu
Subject: [NavList] Re: Calculator v. Slide Rule for Ex-Meridian Correction

The method Letcher describes for clearing lunars is a simple, efficient 
variant of the standard series method. Of course, I have pointed this out 
many times over the years. You can read a basic version of it in my Easy 
Lunars essay (originally 
posted for NavList way back in 2004). The series method requires only three 
significant figures anc can easily be worked on a slide rule (if one is 
compelled to apply an obsolete technology in a fashion which was never 
employed historically). You may also get something from my post on the math 
of clearing 
lunars 
which I wrote up for NavList last June.

Frank Reed

   

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