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: Sextant Collimation Error
    From: Greg Rudzinski
    Date: 2020 Jun 26, 06:54 -0700

    Visually testing collimation deflection on  a Davis Mark 3 ghost ring at 60 degrees altitude in an artificial horizon has the shifting of sun images at about 1/8 th of a solar diameter. The same test using an improvised ghost ring on a C&P with a whole horizon has the shift at about 1/3 rd of a solar diameter. The C&P with a x4 optic has the shift at about 1/10 th of a solar diameter with the sun images looking fuzzy at the objective edge (a tell on collimation error).

    So use extra effort to center field an observation when using a whole horizon .

    Greg Rudzinski

    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