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    Re: Star-star distances for arc error
    From: Bill B
    Date: 2009 Jul 06, 05:51 -0400

    Frank wrote
    > In my own experience, star-to-star angles remain somewhat less accurate than
    > good lunar distance observations, but they have the singular advantage of
    > convenience being available at any moment on any clear night --and with a
    > multitude of choices in angle at any time.
    In my case, I believe the reverse to be true. I've spent way too much time
    determining my astigmatisms distort a sphere, which cause exercises like
    measuring the Sun's semidiamter to be a wee bit off--but predictable .
    There is a repeatable difference between high-elevation Sun limb-to-limb IE
    checks and Sun/horizon IE checks (except for those &%$*!! days).
    I can adjust for the vertical measurements, but when I get into sun-, star-
    or planet-to moon measurements for lunars it gets strange as the angle is
    not always vertical or horizontal, so a guessing game. Alex, for example,
    "learned" to see what alignment (although not text-book perfect) caused his
    lunar observations to coincide with Frank's lunars pages.
    So much for attempting to quantify maddening personal errors.
    Bill B.
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