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    Re: SNO-T tests
    From: Alexandre Eremenko
    Date: 2006 Apr 12, 10:48 -0400

    Jim,
    What you are saying is very interesting.
    When you have time, would you post (or send to me)
    some specific data?
    
    > For what it's worth, I have found that under good conditions
    > measurements  are typically within 0.7' most of the time (say  90% of the time) and
    > within 0.3' about a third of the time.
    
    What sextant do you use? What sort of measurement you are talking
    about (Sun altitudes with real/artificial horizon? Star altitudes?
    Lunar or star distances?)
    
    > I have noticed that there can be some significant differences (0.3 at  times)
    > depending on the source of the almanac data at times.
    
    I only use two sources: THE Nautical Almanach (on paper, commercial
    edition, which is guaranteed to be identical with the Govnmnt edition)
    and Frank's web calculator for the Lunars. Couple of times I reduced
    my lunars myself using the same Almanach, and the result
    (rounded to 0.1') was exactly the same as Frank's calculator gave. So I
    trust
    Frank's calculator (coupled to an electronic almanach).
    
    Another source of error I encountered was the use of various simplified
    reduction
    tables. (I suppose HO tables cannot introduce the error of 0.1', but
    actually I never checked this. My prefered method is Casio f-calculator
    which I trust completely. This calculator was recommended (as the best
    calculator
    for Cel Nav) in a Russian book of 1980 ! Such a pity that
    production of this wonderful
    thing was discontinued! My one is 17 years old, and I see nothing as good
    on the market today. But I hope it will serve another 17 years unless
    I drop it to the sea:-)
    
    Alex.
    
    
    

       
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