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 Terms
    From: Alexandre Eremenko
    Date: 2007 Oct 21, 19:58 -0400

    Dear Dan,
    > IF a sextant:
    > 1) has a frame with an arc of 60 degrees,
    > 2) can measure 120 degrees due to the double
    > reflecting principle,
    Because most sextants actually have somewhat more
    that 60 degrees arc:-) And they are still called sextants.
    Freiberger measures 125 degrees, same does (modern)
    C+P. But Astra IIIb has 130 degrees
    (all these data from Celestaire catalog)
    and my own SNO-T has 140 degrees on the scale.
    All these devices are called sextants,
    though SNO is in fact closer to a pentant.
    Moreover, I have a pocket Troghton and Simms "sextant"
    with the arc of 150 degrees, and still everyone calls
    this a "pocket sextant".
    I also have an aviation bubble horizon MkIXa
    "sextant" with 90 degrees exactly on the arc
    (so it should be properly called an "octant")
    But still everyone calls all these instruments
    All these instruments are double reflecting, of course.
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to 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