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    Re: Latitude by Lunar Distance
    From: James R. Van Zandt
    Date: 2006 Oct 08, 16:46 -0400

    I wrote:
    >   I think I see the principle involved.  Suppose...
    or I could just download the next batch of messages from the list and
    read Frank's excellent description.  And view those magnificent
    figures.  Okay, I have been upstaged.
    I do have one quibble: I believe that if you measure only the angle
    from a star to the nearest limb of the moon, then the apex of the cone
    of position defined by that measurement is not at the center of the
    moon.  Rather, it is along the line from the center of the moon to the
    star, such that the cone of position is tangent to the moon.  If you
    make a second measurement (star to further limb, or lunar diameter)
    you can make the semi-diameter correction and move the apex to the
    center of the moon.  Which does simplify the rest of the reduction.
                  - Jim Van Zandt
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