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    Re: Systematic Error (LOPs revisited)
    From: George Huxtable
    Date: 2003 May 28, 23:28 +0100

    >Peter Fogg:
    >> >Lets start with those 2 intersecting LOPs. If there is a systematic error
    >> >then it will be either towards the direction of the 2 azimuths or away.
    >George Huxtable:
    >> Sorry, but I'm lost already. Presumably Peter is discussing here LOPs from
    >> compass bearings of landmarks.
    Then Bill Noyce pointed out-
    >I think the later discussion makes clear that Peter is discussing
    >LOP's from celestial observations.  In that case, if you draw
    >an arrow from each LOP, toward the body observed, then one "quadrant"
    >has both arrows pointing to it, one has both arrows pointing away,
    >and two "quadrants" have a mismatch.  If the errors in the two
    >observations have the same sign, then the true position must be
    >in one of the two matching quadrants; if the errors are equal,
    >the true position must be on the angle bisector that passes through
    >these two quadrants.
    >Of course, in the two-observation case, there's no information to
    >estimate whether systematic errors are likely.
    >        -- Bill
    Thank you, Bill. Looking back, I think Peter expressed his meaning here
    clearly enough, but I was being particularly dim. Sorry about that.
    contact George Huxtable by email at george@huxtable.u-net.com, by phone at
    01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy
    Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.

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