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    Re: "Vernier acuity" of horizon IC tests
    From: George Huxtable
    Date: 2009 Jul 7, 08:57 +0100

    Bill Morris reports an nice series of tests of index-error variation when
    viewing a distant land-horizon..
    To summarise
    naked-eye set 1:  mean error = 1.467;   SD = 0.458
    X4 Gal.               mean error = 0.743;   SD = 0.187
    X6 Kep.             mean error = 0.593,   SD = 0.129
    naked-eye set 2:  mean error = 1.30;    SD = 0.415
    The surprise, to me, is not in the difference in the scatters, but in the
    difference between the mean values of zero-error.
    Those statistics strongly suggest (though are not yet conclusive) that
    there's a real difference between the index zeros, depending on the
    telescope that's in use. If that's really the case, can anyone suggest a
    possible physical cause? It eludes me.
    contact George Huxtable, at  george{at}hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
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