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    Re: Buying a sextant- a cautionary tale.
    From: Bill B
    Date: 2006 Apr 30, 14:55 -0500

    Alex wrote
    > I use two pairs, one is Castor-Pollux, 4d30'.3 apart, another
    > delta-zeta Orion, 2d44'.2 apart. I use essentially the same method as
    > with the Sun: bring the pair together once on the arc, another time
    > off the arc. The average gives me (the negative of) IC,
    > and the difference twice the distance for control. My sextant permits
    > to measure up to -5d (off the arc).
    I am not clear about your method.  Are you superimposing the point sources
    in a clockwise and anti-clockwise direction, or trying to achieve tangency
    (either in one direction or two directions of drum turns)?  Either way,
    unless your IE is way of, I don't see how you can wind up off the arc with
    star-to-star angular differences in the 3d to 4d range.

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