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    Re: Bubble sextant collimation
    From: Greg Rudzinski
    Date: 2015 May 21, 07:47 -0700

    Andres,

    The eye will do the centering for you. Line up the visual center of the bubble with the visual center of the Sun side by side. This should provide results of between +/- 2' to 4' on an Hs observation. Determining index error will be a trick. Using Polaris as per LaPook method works very well for index error determination (explanation is somewhere in the archives).

    Greg Rudzinski

    P.S. I like practicing just sitting in the passenger seat of a parked car. If your sailboat is moored in a slip then practicing from the cockpit will work pretty good.

    From: Andrés Ruiz
    Date: 2015 May 21, 14:23 +0200

    I am aware how the real situation was during WW2, or is when flying.
    But asking the question otherwise, avoiding Coriolis, on a steady situation, on land, using the limb of the Sun:
    how do you make the observation?
    how do you align the bubble and the Sun? alternatives to the pictures.
    expected accuracy? with 2' or 1' of resolution in the vernier
     
    -- 
    Andrés Ruiz
    Navigational Algorithms
    http://sites.google.com/site/navigationalalgorithms/
       
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