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: sextants on aeroplanes
    From: Gary LaPook
    Date: 2008 Dec 13, 08:16 -0800

    On Dec 13, 1:58�am, Anabasi...@aol.com wrote:
    > Snip
    > Sextants �and quadrants allow a greater
    > range of measurement which might be useful �for lunar distance
    > measurements, horizontal sextant angles for coast wise �navigation and in
    > the rare case of a body within 30� of the zenith with an �obstructed
    > horizon below it but a clear horizon in the opposite direction �in which
    > case the navigator could turn his back to the star and use the �opposing
    > horizon for the sight. (I don't know if this was ever actually �done in
    > real life.)
    > --------------------------------------------------
    > This has been done in practice at sea. �I have done it several times �in the
    > tropics when the sun is high. �Typically because at the regular �azimuth there
    > is a thunderstorm that obscures or muddles the true horizon �but there is a
    > perfectly good horizon 180 degrees out. �Shoot a backsight, �and you are good
    > to go; as long as you remember how to do it. �It is also �in the US Coast Guard
    > tests, but mostly as Hs to Ho reductions.
    > Jeremy
    > **************Make your life easier with all your friends, email, and
    > favorite sites in one place. �Try it now.
    > (http://www.aol.com/?optin=new-dp&icid=aolcom40vanity&ncid=emlcntaolco...)
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@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