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    Re: Navy MK 5 Octant Using Natural Horizon
    From: Alexandre Eremenko
    Date: 2012 May 1, 13:43 -0400

    I am still somewhat puzzled how could you obtain 0.1' error
    from an octant whose scale is reading 2'.
    May I ask you few more questions about the procedure:
    a) what do you exactly mean by "spread"?
    The difference between two extremes? Or the standard deviation
    (=sqrt of the average of the squares of errors)?
    b) to what precision do you interpolate when you read the scale?
    I have not seen the scale but depending on the size of divisions
    one can interpolate such scale from 0.2' to 1'.
    What was exactly your procedure: how many digits after the dot
    your row data have?
    If your spread is the difference of two extremes then I
    do not see how could you possibly obtain such a numbers as 2.1'
    or 2.7' It is also hard to imagine that you can interpolate by eye
    to 1/20-s part of the scale division.
    Or perhaps you will care to type your raw data?

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