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: How Many Chronometers?
    From: Geoffrey Kolbe
    Date: 2009 May 07, 12:40 +0100
    List member John Karl, in his book "Celestial Navigation in the GPS Age", has a nice little section on page 73 entitled Time from a Lunar LOP and a Star Fix. The essence of the method is the LOPs from a number of star fixes will cross neatly at a given point on the chart, but that point will in error in longitude due to the error in the chronometer. The longitude error in a lunar LOP will be slightly different due to the faster motion of the moon across the sky. The trick then is to adjust the time so that all LOPs - including the lunar LOP - cross at the same point. The amount of adjustment required gives the error in the chronometer.

    I had not seen this described before and thought it quite neat.

    Geoffrey Kolbe

    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email 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