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    Re: Sextant accuracy (was : Plumb-line horizon vs. geocentric horiz
    From: Stacy Hanna
    Date: 2005 Feb 13, 09:04 -0500

    > Alex, you wrote:
    > "As I understand, a marksman does not really see the central circle
    > on the target s/he intends to hit. She only sees the larger circle,
    > but with some training she is able to aim at its center
    > with better accuracy than her eye resolution.
    > Something similar probably happens when an experienced observer
    > determines the touch of two discs as you described."
    I used to shoot competively and perhaps can help clarify this. The sights of 
    the weapon are set so that your bullet actually goes higher than where you 
    aim. That way you can aim at the bottom of the black bulls-eye (where the 
    black circle meets the white part of the target) and hit the center of it. As 
    has been stated before it is much easier for the eye to determine where the 
    edge of the circle is instead of the center.

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