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: Obtuse versus acute cocked hat
    From: Bill Lionheart
    Date: 2019 Mar 21, 21:14 +0000

    Dear Robin
    That is an interesting question too Robin, what statisticians call
    "optimal design of experiments", but it was not what I had in mind. I
    was thinking of the empirical distribution of azimuths in fixes
    actually used, say if you look back through a set of plotting sheets
    for a typical voyage,  or a model for that based on a preference for a
    bias towards an equilateral triangle mitigated by the distribution of
    usable bodies at twilight. There are plenty of navigational stars if
    you have  a clear night and can identify them, but one might choose
    the moon and a planet if those are at a suitable azimuth and altitude.
    There will also be plenty of running fixes using sun sights too. I
    should have done this systematically from "Hawaii by Sextant", but at
    a cursory glance I see quite a few obtuse triangles there.
    On Thu, 21 Mar 2019 at 20:18, Robin Stuart  wrote:
    > Bill,
    >     If I understand you correctly you are seeking a figure of merit to 
    decide which set of 3 available bodies is best to use for a fix. This came up 
    recently and I refer you to my suggestion made here,
    > Regards,
    > Robin
    > 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