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: Long Term almanac
    From: Herbert Prinz
    Date: 2004 Apr 1, 10:26 -0500

    Steven Wepster wrote:
    > Good luck indeed! But after 2100 feb 28, you (or, more likely, a
    > future generation) could still use them provided that you subtract one
    > full day from the date.
    Steve and all,
    That's true, but "Bowditch" doesn't tell us so.
    This simple fix equally applies to the declination tables for the years
    1791 to 1806 in J.H. Moore's _ New Practical Navigator_, of which the
    American version was a plagiarism. The correction of some "8000 errors" in
    this book has always been played up as it was the main excuse for the
    appropriation of the text and its subsequent re-edition under a new name.
    Is it not highly ironic then that, after repeating for nearly two
    centuries in the foreword of every single "Bowditch" edition the story of
    how Moore's table for 1800 was wrong by as much as 22' of arc, the modern
    editors would finally commit the exact same mistake?
    The mistake, by the way, is not in the tables; they could not be
    constructed in any other way. The mistake is in the instruction how to use
    them (either by specifying Steve's rule, or by limiting the range of
    Those who want to use Moore's tables in historical work or such should be
    aware that the description itself of the error in the foreword of
    "Bowditch" is inaccurate. A casual reader might be mislead into thinking
    that only the declinations for the year 1800 are wrong. In fact, the
    tables are wrong for all subsequent years, too.
    Herbert Prinz

    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