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    Re: Explanation by Mr. Stark needed
    From: Doug Royer
    Date: 2003 Jun 12, 12:09 -0700

    Bruce,thank you for your time and explaination.I appreciate all the info and
    advice I can get on any subject from the listmembers.There are so many
    differant ways to look at and/or do things.I wish to digest the information
    and proceedures pertaining to this Lunar subject before I ask anymore
    questions.I hope to try this new (to me)proceedure over the next few days
    and try to form my own opinion as to the diffaculty or ease of completeing
    it.Personally I am more experianced and comfortable takeing altitudes than
    measureing angles across the sky from contorted bodily positions.
    As for the thread on towing a log,sure,it's a stretch to consider it a legal
    tow.However,as explained by the inspector,in the narrowest interputation of
    the law it can be considered as binding because there is no physical size
    limit to a towed object.Someone more versed in the law would have to make
    that final decision and the tower would have to decide if the hassle was
    worth  it.
    George,without meaning to be argumenative,check the Colregs as there are
    proscribed signals for a tow < 200 m in lenght.
    Jared,I'm still waiting for your responce to my inquiry reguarding the
    double 4 sight round example.
    
    -----Original Message-----
    From: Bruce Stark [mailto:Stark4677{at}AOL.COM]
    Sent: Thursday, June 12, 2003 10:12
    To: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    Subject: Re: Explanation by Mr. Stark needed
    
    
    Doug,
    
    Please don't hold me to my statement:  ". . . the moon being east or west of
    you doesn't mean you are west or east of her." I was thinking DUE east and
    west. In other words, a body's position angle is hardly ever the reciprocal
    of
    the azimuth. This is easily demonstrated with a piece of string on a globe.
    
    The ideal situation for getting local time or longitude is when a body is
    due
    east or west. That's when it is perfectly in line with the motion you want
    to
    measure, the earth's rotation. But to get GMT from the moon you have to
    measure the moon's motion along her orbit. The earth's rotation has nothing
    to do
    with it.
    
    Years ago, I picked a time from the Almanac and set up a hypothetical
    situation where a boat was expecting to be entering the English Channel in a
    few
    days. Night was falling and weather making up, but the single-handed
    navigator got
    a good cut with two stars, and the altitude of the moon. His LOP lunar put
    the boat well out in the Atlantic. Reassured, he went below.
    
    Trouble was, he was just west of the Scilly Islands. Although the moon was
    within 5? of due west, and all three altitudes more accurate than could be
    expected, the observation was a disaster. The moon's orbital motion, as I
    recall,
    was out of line with her altitude by 79?.
    
    Bruce
    
    
    

       
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