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    Re: Index Error - Real vs. Artificial Horizon
    From: Paul Fithian
    Date: 2013 Feb 28, 14:23 -0800

    Thanks guys!

    I searched around a bit and found this interesting article on how our old friends Lewis and Clark did it: http://www.lewisandclarknavigation.org/InstrumentCalibration.htm

    If and when the sun ever comes out here, I'll zero out the sextant and use a direct sight at the sun to get the correct index error.

    But just curious. Wouldn't the parallax error suggest a need to further correct when looking at the artificial horizon for the same reason?

    In other words, since the index mirror is a few inches above the horizon mirror, wouldn't there be a parralax error here as well, since we are looking at the reflected image in the artificial horizon, not miles away at an actual horizon?

    Or am I overthinking this?
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