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    Re: Daytime Venus Rising Dip Short
    From: Gary LaPook
    Date: 2012 May 5, 21:59 -0700
    I have attached two photos. IMG 8895 is a view through the Kollsman periscopic sextant and 8887 is a view through my Pioneer A-7. Some bubbles in various octants are opaque as in the A-7 so you line up the body with the side of the bubble while others are clear and you center the body in the bubble. See:https://sites.google.com/site/fredienoonan/resources/aircraft-navigation-manual-h-o-216-1941/ho216-1941-180.jpg?attredirects=0

    and https://sites.google.com/site/fredienoonan/topics/pionneer-octant

    gl

    --- On Sat, 5/5/12, Alexandre E Eremenko <eremenko---.edu> wrote:

    From: Alexandre E Eremenko <eremenko---.edu>
    Subject: [NavList] Re: Daytime Venus Rising Dip Short
    To: NavList@fer3.com
    Date: Saturday, May 5, 2012, 10:34 AM


    Greg,

    > In this image the camera gives something other than what the eye is seeing.
    > I see a red circle for the Sun that includes the pictured halo.

    Yes, but there is another strange feature: the bubble looks like a ring
    indeed, but the ring is excentric!
    I suppose you align the Sun with the outer circle, ignoring the inner one.
    In my sextant the bubble looks  like a good, concentric ring,
    I make the INNER circle slightly larger than the Sun, and align
    the Sun with the inner circle.

    Perhaps I am doing wrong, and I have to make smaller bubble,
    ignore the inner circle and align with the outer one??

    Alex.



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