Welcome to the NavList Message Boards.

NavList:

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

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Poor St. Hilaire
    From: Frank Reed
    Date: 2007 Oct 27, 21:48 -0400

    Gary, you wrote:
    "Today, with programmable calculators, it is trivial to go back to
    Sumner's method and plot the LOP after determining two points using
    the "time sight" computation."
    
    Right. And one advantage of the Sumner approach compared to the St. Hilaire
    intercept approach is that you can use any old graph paper, including graph
    paper drawn up on the spot. With a Sumner line, it doesn't matter if you
    have the correct local scale for minutes of longitude. Sumner himself erred
    by suggesting that his lines should be drawn on a Mercator projection, and I
    suspect it slowed the adoption of the method.
    
     -FER
    
    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    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