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    Re: Using star-star distances
    From: George Huxtable
    Date: 2008 Sep 24, 10:37 +0100

    Frank Reed had described an observation of remarkable short-term instability
    in a plastic sextant, and I had asked for further details of the
    I though I had understood exactly what he was doing, until these words-
    "In any case, the sextant was lying
    | on its side and completely untouched during this test. What I was
    | was looking through a 10x scope without touching it at all. One could
    | visibly see the changes in just a few seconds. Very entertaining! "
    Which raises a few further questions; if Frank will help a bit further,
    about the measuring setup in use, which I am trying to picture. It seems to
    be somewhat different from the usual angle observation that's made with a
    Does the plastic sextant he was testing REALLY include a 10x telescope
    option? Or was the 10x scope added as an aid to precision? Where, in the
    optical system, did it go?
    If two-arc-minute changes were being observed, how were they being measured,
    if the instrument remained untouched throughout?
    A simple diagram would work wonders.
    contact George Huxtable, now at george@hux.me.uk
    (switched from george@huxtable.u-net.com)
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
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