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    Re: Latitude by Lunar Distance
    From: Alexandre Eremenko
    Date: 2006 Oct 15, 13:06 -0400

    
    Dear Fred and Frank,
    
    > On Oct 5, 2006, at 11:01 PM, Frank Reed wrote:
    
    > > I have seen amateurs get 0.1 minute accuracy in lunars on the very
    > > first try.
    
    I have also seen this. For example, my own first try
    (posted on the old list 2 years ago).
    
    The question is whether one can achieve this
    RELIABLY and SYSTEMATICALLY.
    
    > > Of course, every once in a while my eyes will water or my hands will
    > > shake, and then it's as much as ten times worse.
    
    Do you know BEFORE the reduction and comparison
    with your true position that your hand shaked or
    eyes watered? Or you come to this conclusion AFTER
    you discover a 1' error?
    
    > ship around 1875.
    > The standard error was around 0.25', as I recall.
    
    I posted once (on the old list) statistics of
    many Russian observations from a ship
    (including Sun and star altitudes and star distances),
    all observations made by professionals,
    under various conditions, presumably with Russian sextants.
    (I can post this again, on the new list).
    
    My own observations are somewhat less accurate than those,
    especially in star distances, where I have more data.
    
    Alex.
    
    
    
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