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: Chronometer Suggestions
    From: George Huxtable
    Date: 2009 Jan 6, 14:57 -0000

    Bill Sellar asked-
    As a beginning celestial navigator, I am wondering how much time and watch 
    accuracy is actually required for practical navigation. Can we predict how 
    many miles off one would be for every second of time error?
    A fair question. Answer: a quarter of a minute of longitude, which 
    corresponds to a quarter of a mile in position-error at the equator, and 
    correspondingly less at highter latitudes. That corresponds to the rate at 
    which the Earth spins, 360� in 24 hours.
    The precision available from a chronometer ceased to be of any great 
    importance once radio timing signals became available. Bill |Sellar has to 
    realise that many denizens of this list share a quest for precision for its 
    own sake, rather than for the purposes of practical navigation: and who are 
    we to deny them their fun?
    contact George Huxtable, at  george@hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. 
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com

    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