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    Re: Sextant accuracy (was : Plumb-line horizon vs. geocentric horizon)
    From: Alexandre Eremenko
    Date: 2005 Feb 12, 10:36 -0500

    On Sat, 12 Feb 2005, Frank Reed wrote:
    > Alex, you wrote:
    > "after long practice I can achieve 0.2 to 0.3 accuracy most of the  time,
    > with my 7x scope, both for lunar and star-to star distances."
    > Interesting. I remember you were puzzled by the star-star distances a  couple
    > of months ago. Are you saying that they have finally fallen in line to  your
    > satisfaction?
    Well, I said "most of the time". It still happens that I get bigger
    errors of 0.5 or 0.6. So the satisfaction is not complete.
    On your earlier message today on the human eye resolution.
    I think it is more complicated than that.
    "Resolution" is the ability to see two point sources apart.
    But frequently I see two stars collided in one spot, (so I already cannot
    tell them apart) but still understand
    that this collision is not perfect. Then I try to make this "spot"
    as small as I can. I believe that a human eye can be trained to increase
    this ability.
    If you look at the marksmen results (with a rifle, with no optical sight)
    you can conclude that the human eye ability to aim a rifle is
    better than 1'.

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