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: Lunars using Bennett
    From: Peter Fogg
    Date: 2008 Apr 5, 18:33 +1100

    Alex, you wrote:
    > I have to say that several years ago
    > I decided not to
    > participate in any discussion of statistics on
    > this list.
    However, your statement:
    >  The tables in Bennett do not have sufficient
    >  accuracy ... because they are
    >  rounded to 1'.
    >  ... and the errors will accumulate).
    seems inconsistent with this decision.
    And that "will accumulate" seems inconsistent with:
    >  They will do both things: cancel but still
    >  accumulate.
    Bill Noyce, you wrote:
    > I only bothered to look at the first two lines of data presented ...
    If 100 was a small sample then 12 is even smaller!  What does this
    0.61 indicate? That values that are either rounded up or down will, on
    average, have a rounding 'error' of 0.5?
    I'm not sure that this much is in contention.  The claim leading to
    the experiment was that the roundings could add up to an error of 3
    minutes of arc (0.5x6).  Which seemed to be what Alex was saying, too:
    "the errors will accumulate".  While in theory this 3' error is
    possible, I set out to show that in practice it is so unlikely as to
    present a negligible risk.
    I think the results speak for themselves: 86% within 1', 14% within 2'.
    As for the "well-established fact", if this indicates [0.5 x sqrt6 =
    1.22], then we may not need to argue about that, either - this may not
    be inconsistent with the results of the experiment.
    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