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
    Name or NavList Code:
    Email:
       
    Reply
    Re: Doniol Longhand MHR-2015 package
    From: Bob Crawley
    Date: 2015 Jan 28, 01:33 -0800

    Hanno - My idea was that with your pack this would give a system with very few pages that would allow positions to be calculated without electronic aid using both Sun and Stars. I tried to follow the system in the Table 4 Almanac but have a problem with the up/down roundings on time mins & seconds which needs adjustment. One arcinute error equates to up to a one mile positon error as I understand it so we do need time seconds. 

    I'm now looking at adding the data for 57 stars to make it more useful. These change with time however and whilst the difference over the year is acceptable it's significant over several years. The variation seems to increase with declination so maybe a correction for precession is needed. I suppose with a ditch kit it could be updated each year so the pepetual aspect may not be that important. I'll do an improved version shortly.

    Regards

    Bob

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.
    Email:

    Email Settings

    NavList ID 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