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: Method used to compute navigational tables.
    From: George Huxtable
    Date: 2010 Jan 30, 23:44 -0000

    Gary wrote-
    | I just noticed in a volume of H.O. 214 printed in 1940 a statement that
    | the computations were done with seven place logarithms. This shows that
    | the early volumes were computed by hand. This was done as part of the
    | WPA program to put out of work mathematicians to work during the
    | depression. I wonder when these tables started to be calculated with
    | computers? Think of the amount of work doing all these calculations,
    | (720 entries per page, 259 pages per volumes, 186,400 entries per
    | volume) by hand.
    Gary may be interested in the following reminiscences by Donald Sadler, who
    was superintendent of the Nautical Almanac Office in Britain over the period
    between 1936 and 1971, which spanned the transition between hand,
    electromechanical, and electronic computation.
    There's other interesting stuff in the same historical section of the
    Nautical Almanac Office website.
    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.

    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