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    Refraction affects interstellar angles
    From: Paul Hirose
    Date: 2002 Feb 19, 10:55 -0800

    Chuck Griffiths wrote:
    > stars are located at the same altitude. I got the idea most recently from both
    > "The Sextant Handbook" by Bruce Bauer and "Celestial for the Cruising Navigator"
    > by Merle Turner. I also vaguely remembered the Ocean Navigator article
    Those authors may have picked up their misconceptions from Bowditch.
    Describing a test for centering error, my 1984 edition of Vol. 1, in
    Art. 1509, "Sextant adjustments", says, "An alternative method is to
    measure angles between the lines of sight to stars, comparing the
    measured angles with computed angles. To minimize refraction errors,
    one should select stars at about the same altitude, and avoid stars
    near the horizon."
    paulhirose@earthlink.net (Paul Hirose)

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