## A treatise on navigation and nautical astronomy, including the theory of compass deviations |

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apparent noon applied approximate astronomical athwartship azimuth chronometer circle coefficients column compass bearing compass needle component computed Corr correction corresponding course and distance curve declination deviation due difference of longitude directive force earth and ship earth's East easterly equation error fore-and-aft formula given Greenwich mean heavenly body horizontal force hour angle inducing force instant interval limb longitude magnetic bearing magnetic course magnetic meridian magnetism induced mean noon Mercator chart meridian altitude method minutes of arc Nautical Almanac navigator North end North point observation obtained parallel plane polar pole prime vertical quadrantal deviation represented rhumb line right ascension sailing sextant ship swings ship's head sidereal sight South star starboard subpermanent magnetism sun's tangent tion transit triangle true altitude true course tude variation versin vertical soft iron West westerly zenith zero