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: Bowditch long term almanac
    From: Geoffrey Kolbe
    Date: 2012 May 20, 06:57 +0100

    Hello Oerjan
    Thanks to Frank Jones and for your illumination on spelling and
    pronouncing your name.
    >QUAD GHA corr and QUAD Dec corr in the Bowditch almanac is same for
    >all four years in the cycle, I would think each "day" would require
    >its very own correction, to me this means that they are likely
    >average or something similar of the four years in question.
    >if you look at attachment below you see what I mean, correection for
    >all four years are the same.
    You are correct. And in my LTA, each day of the four years does have
    its own correction. And they can differ considerably over the four
    years for a given day in the year. This is a puzzling feature of the
    Bowditch LTA which makes it almost useless as a LTA . There are
    months in the year(s) when the corrections are not only incorrect in
    value for any period I try, but in sign as well! I am not surprised
    that this LTA is not continued in the current Bowditch.
    Geoffrey Kolbe

    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