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: Burdwood's Tables
    From: Chuck Taylor
    Date: 2007 Oct 9, 21:12 -0700
    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.
    I have a pair of azimuth tables

    H.O. No. 71  Azimuths of the Sun and Other Celestial Bodies of Declination 0 to 23
                          [Fifteenth Edition] United States Navy Department Hydrographic Office
    H.O. No. 120 Azimuths of Celestial Bodies Whose declinations range from 24 to 70 degrees
                           for latitudes extending to 70 degrees from the equator
                           [SEVENTH EDITION] United States Navy Department Hydrographic Office

    What is the relationship between these two sets of tables and Burdwood's Tables? They appear to contain essentially the same data, except that in H.O. No. 71 the azimuths are given in degrees and minutes (vice degrees and tenths) for every 10 minutes of time (vice every 2 minutes of time). Another obvious difference is that Burdwood's tables are British, and these are American.

    There is no mention of Burdwood in either of these publications.

    Here is an excerpt from the preface of H.O. No. 120: 

         "This work was prepared by the Hydrographic Office in 1902 on account of the value of star observations in determining azimuths, and the growing necessity of frequent observations for position in high-speed ships.

         "Taken together with the solar azimuth tables of the Hydrographic Office, which give the true bearings of the sun and other celestial bodies within ecliptic limits, the present tables supply the navigator with ready means for finding the azimuths of the great majority of bodies appearing in the firmament and for applying, over a vastly increased extent, the other useful objects of azimuth tables, such as finding the true course in great-circle sailing and laying down the Sumner line of position."

    Best regards,
    Chuck Taylor
      48d N
    122d W

    Check out the hottest 2008 models today at Yahoo! Autos.
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to 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