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    Re: Vernier sextant
    From: Alexandre Eremenko
    Date: 2007 Mar 6, 00:17 -0500

    we will do it sometime soon.
    My bad results with Lunars yesterday
    I mentioned in the previous message
    happened because I confused the limbs.
    The Moon was almost full, and I took the
    wrong limb:-)
    Today the results are better, but still there
    is systematic error of about 1',
    for the 120 deg distance between Moon and Aldebaran.
    Have to check colimation yet.
    At small distances and convenient sextant
    position (Rigel-Betelgeuse, 18 degrees),
    I had a perfect result yesterday, to 5".
    P.S. The air sextant measures to 3'-4' precision
    for Sun, Venus and Sirius. Worse for the Moon,
    because it is not round and hard to align with the
    round bubble.
    Actually, I think this sextant is a good alternative
    for a small boat to a plastic sextant. I don't know whether
    the averager will help on a small boat in rough weather.
    But being independent of the
    natural horizon (which is frequently obscured by the
    waves) should be very
    useful. Without the averager, the sextant is small and
    lightweight. And it seems much more robust than a marine
    On Mon, 5 Mar 2007, Bill wrote:
    > > Bill,
    > >
    > > On Mar 3, 1:36 am, Bill  wrote:
    > >
    > >> I'm still waiting on more bubble sextant results.
    > >
    > > I have plenty. And I am ready to share them with you.
    > > I just do not post them on the list,
    > > because, apparently there is no interest in the raw
    > > numbers in this list.
    > OK then, how about some processed data for various bodies�  Average and
    > sigma.  The good, the bad and the ugly. 
    > Bill
    > >
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