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    Re: Calculator v. Slide Rule for Ex-Meridian Correction
    From: Frank Reed
    Date: 2016 Jan 3, 12:08 -0800

    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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