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
    Chasing accuracy with AH sights
    From: Randall Morrow
    Date: 2014 Mar 28, 16:35 -0700

    On 25 March I gt a 10 body run of sights with and averaged a=0.67 from GPS. Two were altitudes over 100 degrees and without these the 8 sight average was a=0.34 from GPS. Bodies shot were Sirius, Rigel, Aldebarran, Capella, Mirfak, Dubhe, Regulus, Alphard, Adhara and Alnilam. Just some "observations" about chasing accuracy:

    Brightness of the body does not sem to be a factor. Alnilam was a=0.0 and so was Capella.

    Being really careful with focus does seem to make a difference. You have to split the diffeence between perfect focus on the mirror body and on the sky body. Careful attention to focus balance between the two seems to help.

    Being very "honest" about your subjective decision about when youe mark the instant of tangency or coincidence is very important. As you make those final rocks and micrometer drum movements think of it like shooting a gun. Are the sights really on the target or do you think they are? I believe this perception of that is likely the most important factor. If it does not "feel" right, take the scope from your eye, relax and shoot again. Results will likely improve.

    My obsetrvations are not based on knowlegde, but lots of experience taking sights. Have fun.

    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com

    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