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: Longitude via lunar altitudes, simplified
    From: Peter Fogg
    Date: 2007 Mar 12, 17:37 +1100

    Frank wrote:
    > Longitude by lunar altitudes is typically TEN TIMES less accurate than
    > longitude by lunar distances.
    
    How have you calculated this, Frank?
    
    When you write, about the clearing of lunar distance:
    > The mathematical difficulty is minimal.
    
    It seems to me that what you are saying is that I, Frank Reed, think
    it is fairly easy.
    
    What I have proposed is that a perception of this difficulty, held by
    many mariners who could have been assisted by lunars, has prevented
    them ever becoming widely appreciated and used.
    
    It is a tribute to the navigators (and American education and
    ingenuity?) who filled out the logbooks you have referred to, that
    they apparently were familiar with lunars and used them with ease. My
    own readings of nautical happenings, including passages of boats well
    into the twentieth century, from a variety of countries and cultures,
    indicates that the navigational prowess on many smallish craft
    (including trading ships) was quite limited.
    
    Its difficult to argue with people's perceptions. They might be wrong,
    but your saying as much will rarely change the way they think - and
    has even less chance of changing the way they thought in the past!
    
    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@googlegroups.com
    To unsubscribe, send email to NavList-unsubscribe@googlegroups.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