Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
    Re: Dreisonstok Compliments Weems
    From: Greg Rudzinski
    Date: 2009 Dec 14, 13:43 -0800

    I would like to add this rule for all bodies :
    A. If Latitude and declination are the same in name use Dreisonstok.
    B. If Latitude and declination are contrary in name use Weems.
    
    This will keep things positive.
    
    On Dec 14, 12:50�pm, Greg Rudzinski  wrote:
    > In the process of comparing short methods of non electronic sight
    > reduction it came to my attention that the subtle differences between
    > Dreisonstok and Weems tables actually compliment each other very well
    > thus making it worth while having both copies at hand. The beauty of
    > having both lies in the treatment of declination as a plus or minus.
    > What I like to do is add instead of subtract where ever possible so by
    > using Weems in the northern hemisphere fall/winter and Dreisonstok in
    > the northern hemisphere spring/summer addition of declination is
    > maintained. The other beautiful compliment is the graph vs. tabular
    > azimuth determination. When speed is needed then the Weems graph is
    > used. When accuracy for compass error determination is needed then
    > Dreisonstok is used. Once an Hc is determined by Weems then extracting
    > Z' and Z" from Dreisonstok is simple.
    
    -- 
    NavList message boards: www.fer3.com/arc
    Or post by email to: NavList@fer3.com
    To unsubscribe, email NavList+unsubscribe@fer3.com
    

    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    Posting 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