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2nd obsn accuracy accurate angle approximate Azimuth Tables bearing Blackburne's Board of Trade body calculation Captain chronometer indicated column correction corresponding course Cross Decl declination determined Diff difference distance east edition error Ex-meridian Tables examinations examples factors FIGURE finding given gives greater Green Hilaire hour hour-angle illustrates improved known latitude less light limits line of position Long longitude M.T. Sp masters mean meridian method miles minutes Nautical navigation noon object Obsd observations obtained officers pass plane chart plotting position of ship position-line Posn.-line practical prefer problem published Redn Reduction Required result rule run in interval ship's position sights SIRIUS stars Sumner sun's Tables for Azimuths taken tion true altitude Variations writer Zealand