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    Re: Artificial horizon
    From: Fred Hebard
    Date: 2005 Feb 20, 16:32 -0500

    I couldn't find the accuracy of the C+P on their website, at
    , but it may be
    elsewhere on that site.  I would expect something on the order of 0.5'
    to 1.5'.  Most bubble sextants have accuracies in that range, usually
    around 1.0'.
    The Frieberger may be limited by the levels, so that more accurate
    levels would give a higher accuracy.  I'm guessing here that the mirror
    itself is ground considerably flatter than 0.5'.
    On Feb 20, 2005, at 2:38 PM, Alexandre Eremenko wrote:
    > Fred,
    > Do you know the accuracy of the Cassens-Plath
    > art horizon?
    > I think 0.5' of the Friberger is too crude.
    > (They should really make something better for $900:-)
    > Last weekend I could consistently obtain Sun altitudes
    > with less than 0.2' error in every single measurement,
    > and less than 0.1' in the average of a series of 3,
    > with a Davis art horizon filled with vegetable oil.
    > (The results for the Moon altitude were much worse).
    > Alex.

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