The resulting line of position ( " LOP " ) is a small segment of the circle of equal altitude, and is represented by a straight line perpendicular to the azimuth of the celestial body.
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Discovery of the circle of equal altitude-A New and Accurate Method of Finding a Ship's Position at Sea, by Projection on Mercator's Chart, Capt . Thomas H . Sumner, July 1843, Thomas Groom & Company of Boston
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