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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: SNO-T tests
From: Frank Reed CT
Date: 2005 Dec 9, 21:12 EST
From: Frank Reed CT
Date: 2005 Dec 9, 21:12 EST
Alex, you asked: "did you test it with a good sextant as well? Does the test with a good sextant show no eccentricity?" No, I haven't yet. I think the method works despite the parallax issue. The only assumption is that the measured angles should be increasing linearly. The fact that the pattern repeats with a one degree period over two full degrees of measurement gives me some confidence that this technique is measuring something involving micrometer error. What else could produce such cyclic behavior? By the way, my first iteration of the screen display was one line on top and about one hundred lines (spacing 10 pixels) on the lower half of the screen. Looking at all those lines and their reflected images through the sextant drove me nuts so I switched to the "one line above - one line below" approach. There's probably a compromise with fewer lines that will work well, too. -FER 42.0N 87.7W, or 41.4N 72.1W. www.HistoricalAtlas.com/lunars
