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    Re: fix from repeated observation: was Re: Coriolis vs Noon curve correction
    From: Jeremy C
    Date: 2009 Apr 26, 15:21 -0700

    To be clear, the lines I am currently talking about (not the Moon line
    from last year) are lines of a single body (Sun and Venus) on either
    side of upper transit, shot over about an hour of time in January.  I
    did cluster more observations around the calculated time of LAN.  I
    shot many lines, but could only use 25 in the program so I started
    taking every other one or so.  I am away from my navigation notebook
    right now, but will attach a short PDF of the data in about a week
    when I return home.
    As far as accuracy of lines in 10 minutes or so (I can shoot about 20
    lines in this time) at various times away from upper transit; I will
    have to experiment with this upcoming trip.  I don't have any
    unreported data of this kind.
    As far as how the program works I am not certain as I am far from a
    computer expert.  I can feed it an artificial DR but as a matter of
    course the ship doesn't DR more than an hour or so, and with ECDIS
    usually we are withing 0.25 nm on either side of track, but I can
    tweek the numbers and see what the program does.
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