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: Halley's lunars, back in 1698-1700
    From: Wolfgang K�berer
    Date: 2004 May 6, 20:26 +0200

    Dear George,
    
    let me add some historical detail to your post about Halley:
    
    He wasn`t the first one to propose finding longitude by magnetic variation,
    of course. Notable precursors were Simon Stevin in his "Haven-Finding Art"
    (London 1599; reprinted Amsterdam/New York 1968) and Guillaume de Nautonnier
    "M?cometrie de Leymant" (Venes 1603). There is a complete refutation of the
    latter`s theory in the second edition of Edward Wright "Certaine errors in
    navigation detected and corrected..."(London 1610), the work that laid the
    mathematical foundations of the Mercator projection.
    
    More detail on the efforts of finding longitude by variation can be found in
    D.W. Waters "Art of Navigation in England in Elizabethan and Early Stuart
    Times" (London 1958) and of course in "The Quest for Longitude". A.R.T.
    Jonkers "Earth?s Magnetism in the Age of Sail" (Baltimore/London 2003), a
    condensation of his dissertation - which is a mine of information concerning
    magnetism, compasses and navigation - gives more information on the
    background.
    
    Regards,
    
    Wolfgang
    
    Life member of
    TINSTAARG (There is no such thing as a responsible gun)
    TOTTCHAIAUITPOBIAGW (The only thing that Charlton Heston and I agree upon is
    that Patrick O`Brian is a great writer)
    CSSTHOBIEMAATNCTKA (Can`t somebody stop this habit of broadcasting in
    e-mails memberships and allegiances that nobody cares to know about)
    
    
    

       
    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