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    Re: What is the Longest Lunar Possible?
    From: Brad Morris
    Date: 2013 Jan 21, 15:03 -0800

    Hi Geoffrey

    Attached, find an image of the optical path of the prismatic reflecting circle. Note that this is from Chauvenet and not a self generated image. It shows the optical path (dotted line) at 180 degrees!

    I see how the instrument becomes sensitive at 180. While the paths are parallel, they are not colinear, generating parallax. Additionally, small displacements of the instru from the line between the two objects

    What then is your view on the largest possible measurable distance, as a practical matter? Should it be limited to 170? 165?

    Best Regards

    Brad
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