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: Portuguese shipwreck question
    From: George Huxtable
    Date: 2009 Nov 3, 17:03 -0000

    Apache Runner wrote, in reply to Frank's suggestion about a projection on
    which to put his mediaeval data-
    | Uh...because I was teaching Mercator projections last week?  Because
    | said so?  Both?
    My own views shouldn't be taken too seriously on this matter. It's just that
    Mercator is the first projection that comes to my mind in terms of sea
    navigation, because it preserves the direction of bearings.
    But the mediaeval gazetteer that's under discussion here appears to be more
    related to travel by land than by sea, and it may well be that a simpler
    alternative, or one which preserves travel-distance better than Mercator
    does, may be more useful. Frank knows more about such matters than I do, and
    his suggestion of a conical projection should be taken seriously.
    The OMC website that I referred to allows for the following choices for
    Mercator, Equidistant cylindrical, Polar stereographic, Lambert azimuthal,
    Azimuthal equidistant, Orthographic.
    But don't ask me to explain the differences between them.
    As for Thule, there seems little doubt that mediaeval navigators, Celts and
    Vikings, got that far, and that it was indeed what we now call Iceland. But
    that doesn't imply that every early voyager who claimed to have reached
    Thule really had. Those given coordinates for Is. Tule were a long way out,
    but then so they were for many other places on the Marseilles list.
    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.
    NavList message boards: www.fer3.com/arc
    Or post by email to: 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