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: Astro Navigation at HMS Collingwood
    From: Brad Morris
    Date: 2018 Nov 11, 11:21 -0500
    Hi Bill

    While a planetarium might serve as an interesting way to introduce concepts like the celestial sphere, effect of earth rotation and effect earth's orbit on the observed sky; it suffers from a terrific defect.

    To wit:  unless the student is precisely at the center of the dome (sphere) of the planetarium screen, severe angular errors are introduced.  The angle measured is directly affected by the baseline or distance. Given four different seats within the planetarium, there will be four different angular readings.  These errors preclude any meaningful reduction of observation.  Indeed, the students will be confused, because they don't get the same answer!  Was it because they absolutely failed at the observation or was it just seat assignment?

    If the intent is basic introduction or very basic sextant skills, then there is no real objection.  If however, the student is going to make any steps beyond that very basic introduction, the planetarium suffers.  


    On Sun, Nov 11, 2018, 10:47 AM Bill Lionheart <NoReply_Lionheart@fer3.com wrote:

    I wonder if anyone knows what they still teach the RN about astro
    navigation. (I am believe I am right that the RAF and RN still use the
    terminology Astro rather than Celestial?) . I am fairly sure it is
    taught at HMS Collingwood and I found this interesting article about
    Lieutenant Jon Sutcliff pioneering the use of a planetarium as a
    teaching aid.
    It might of course be secret!
    Bill Lionheart

    View and reply to this message

    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