Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: That darned old cocked hat
    From: George Huxtable
    Date: 2010 Dec 11, 21:45 -0000

    John Karl wrote-
    
    "George’s irrelevance
    A.  He measures triangles from a known location."
    
    If, instead of simply accepting a predicted distribution, we wanted to TEST 
    the matter in real life, to decide whether or not each triangle embraced 
    the observer, we would indeed need to know the observer's exact position.
    
    "B.  And then he counts the number of times (i.e., the percent of time) 
    that the known location is outside of the triangle.  (So yes George, you do 
    need to know the fix location in order to do this counting.)"
    
    "C.  This is not navigation.  It’s not determining anything about George’s 
    location – we already know that.  It’s determining information about the 
    random distribution of the triangles."
    
    From that test, the result we will find is that from that known position, 
    the triangle will embrace the observer, on average, one quarter of the 
    time. Does John Karl dispute that?
    
    And if we then make another such test, from a different known location, we 
    will find exactly the same thing. After a few such tests, we can quickly 
    deduce that it's equally true from any point on the Earth's surface. It 
    doesn't matter whether the location of the point is known or unknown;  it's 
    a general truth that applies the whole World over. One out of four. QED.
    
    If John Karl disputes any step in this argument, he can explain exactly 
    what is wrong. The logic remains unshaken, so far. His questions about 
    whether it is, or isn't, "relevant to navigation", are no more than a 
    distraction.
    
    What, exactly, does his 86% figure represent? If it's the probability of an 
    observer being outside the observed triangle, then one of us has to be 
    wrong, although some Navlist comments have tried to claim that we can both 
    be right.
    
    George.
    
    contact George Huxtable, at  george{at}hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
    
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    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