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: Rust's diagram for computing azimuth
    From: John Cole
    Date: 2007 Oct 09, 20:22 -0500
    Re: [NavList 3396] Re: Rust's diagram for computing azimuth Here’s a page from Burdwood’s Tables. The latitude limit is 64 degs in the second edition. Commander John Burdwood RN was was in the Admiralty Hydrographic Department.  The second edition 1940 was revised by Percy Davis FRAS of HM Nautical Almanac Office.



    From: Peter Fogg <piterr11---.com>
    Reply-To: <NavList@fer3.com>
    Date: Wed, 10 Oct 2007 09:54:34 +1000
    To: <NavList@fer3.com>
    Subject: [NavList 3396] Re: Rust's diagram for computing azimuth

    Can you let us know some more information about these Burdwood's Tables, John?

    On 10/10/07, John Cole <jfcole{at}tokopah.com> wrote:

    In an earlier time Burdwood's Time Azimuth Tables were used
    extensively to correct the compass and for other purposes, indeed
    according to the preface of my 1940 second revised edition "for fifty
    years Burdwood's Tables have been known and used by every seaman". The
    full title is "Sun's True Bearing or Azimuth Tables." Those who
    learned navigational astronomy from Smart's venerable "Spherical
    Astronomy" or his wartime "Handbook of Sea Navigation" will be
    familiar with them.

    On Oct 8, 1:42 pm, Gary LaPook < glap...---.net> wrote:
    > Gary LaPook writes:
    >
    > Attached is Rust's diagram for computing the azimuth of the sight which
    > was included in Weems "Line Of Position Book," 1927. It was developed
    > using the sine formula. You enter on the left with LHA and go to the
    > right to the declination then straight up to the altitude then to the
    > right to the azimuth. Also included is a table used to determine in
    > which quadrant the azimuth falls when the body is close to east or west.
    > This diagram can be used with any set of tables, H.O. 208, H.O. 211,
    > etc., and the extra steps used in those tables to compute the azimuth
    > can be disregarded.
    >
    > The shape of these curves show  the potential loss of accuracy using the
    > sine formula as the azimuth approaches 90º as the altitude curves become
    > almost vertical and only slight changes in altitude results in large
    > azimuth changes.
    > --
    >
    >  Rust diagram.pdf
    > 206KDownload







    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---

    File: 103397.burdwoodtablespdf.gif
       
    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