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    Re: Sextants and Glue [was Sisteco Prismatic Compass]
    From: Fred Hebard
    Date: 2004 Mar 23, 23:03 -0500

    Well, the old C+P I got might be an OK instrument!  I took two sights
    tonight, of Jupiter & Sirius and Ho-Hc for three replications of each
    was 0.042896+/-0.308899, and -0.07455+/-0.212369, where the error
    figure is the square root of the mean of (Ho-Hc) squared; since Hc is a
    parametric mean, the degrees of freedom should equal the number of
    replications.  I've never gotten so close previously, although the
    standard deviations leave a bit to be desired.  Ten to thirty more
    shots and I might get a fair idea of how good this sextant is.
    
    I was driving west and north for a few hundred miles this evening and
    the new moon was hanging about 15-20 degrees underneath Venus.  It was
    perfectly clear and still and would have been a beautiful lunar, easy
    to shoot.   Of course when I got home, the low western sky had clouded
    over.
    
    I have a fair amount of data for my Husun now, which I may get a chance
    to share with the list.  It appears to need about 25 seconds of arc
    added to the existing corrections, although there's some additional
    periodicity in the errors which I don't know how to handle, having
    never fit such data.  I still need to get a chance to fool around a bit
    with the data first.  It would help also if I broke down and got the
    Husun's horizon mirror resilvered.
    
    
    

       
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