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    A-7 Bubble Octant Practice
    From: Greg Rudzinski
    Date: 2011 Dec 16, 11:19 -0800

    Today's clear morning sky offered an opportunity to practice with the A-7 bubble octant :) The goal was to build confidence in using the averaging mechanism. Observations were made of the Sun from the passenger seat of my car through the side window to closely match the cramped seating on an aircraft. No difficulties were encountered for the 6 individual sights or the 4 averaged sights. The scatter for the individual sights came in at 7.9' moa vs. a scatter of 3.5' moa for the averaged sights. No question that averaging works. The simple pencil markings on the micrometer drum provided a fine visual for determining a median.

    The next practice session will be at night to see how to best manage lighting issues.

    Greg Rudzinski
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