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: problems with artifical horizons
    From: Alexandre Eremenko
    Date: 2012 Mar 20, 22:02 -0400

    1. As you already measured the alt of the sun before,
    you could preset your sextant on this altitude.
    Pre-setting sextant on an approximate alt frequently helps, espesially
    if you observe through the holes in the clouds, and have little time
    to search the sun.
    The approximate alt can be computed with
    a) star globe, if you have one (Russian manuals recommend this)
    b) a star finder (there are many types, soe of them cheap and handy).
    c) special tables (the Complete on board Celestial Navigator has them).
    In general, tis is an excellent thing, don't know why they do not cell
    paper copy anymore. But you can print and bound yourself).
    2. I also use the following method sometimes. With real or artificial
    especially with stars.
    Take your sextant upside down, point it on the Sun, so that you see it
    through your horizon mirror (don't forget the shade). This is easy,
    becasuse you feel where the Sun
    is with your face. Then swing the arc to catch the reflected Sun.
    Once you catch it, take the sextant in the normal way.
    This is easier with Davis if you put its own filter on it,
    and remove the sextan Index filter from the field of view, while
    searching. Don't forget to put it back when you invert the sextant to hold
    it in the normal way.
    3. Another method. Remove the telescope. This helps in searching.
    Especialy if your telescope is a strong one with a small field of view.
    Once you catch the Sun, put  the telescope back.
    Hope some of these techniques help.

    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