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
    or...
       
    Reply
    Re: Problem with a sextant
    From: Alexandre Eremenko
    Date: 2006 Apr 25, 08:50 -0400

    On Tue, 25 Apr 2006, Bill wrote:
    
    > In the global overview, we (you and I at least) are striving for a 0.1' to
    > 0.2' intercept with a static land-based environment. I am not clear the
    > nautical almanac coupled with sextants represent a system that can achieve
    > that accuracy repeatedly.
    
    My goal is somewhat narrower. I don't care about almanach, reduction,
    etc. All this can be done very precisely (Using Astronomical Almanac,
    for example etc.) I also do not preset any target numbers like 0.2'.
    My question is: what is the real accuracy of my instrument, coupled
    with my ability to use it?
    And what is the real accuracy of the best sextants.
    
    Whatever it is I would like to discover it with my own experiments.
    It is not the MAGNITUDE of the errors which frustrates me so
    much in this case. It is that they are all of the SAME SIGN!
    It is a SYSTEMATIC error whose reason I don't understand.
    
    I hardly EVER made a signle undershot in these years!
    THIS is really frustrating, not the magnitude of the errors.
    
    If a little speck somewhere on the arc causes this,
    then SNO-T and Freiberger is just a poor design.
    Because on your Astra you could inspect the worm with
    a magnifying glass, and discover the speck, and with the stupid enclosed
    trommel
    I cannot do this.
    
    Alex.
    
    
    

       
    Reply
    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