Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Calculator v. Slide Rule for Ex-Meridian Correction
    From: Alexandre Eremenko
    Date: 2016 Jan 3, 22:43 +0000

    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.
    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 
    which I wrote up for NavList last June.
    Frank Reed
    View and reply to this 

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.

    Email Settings

    Posting Code:

    Custom Index

    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site