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1st Observat1on 1st obsn 2nd Observat1on 2nd observation 2nd obsn Accl Aldebaran angle Azimuth and Reduction Azimuth Tables Blackburne-s Board of Trade Canopus Captain chronometer indicated M.T.G. correction Cosec course Decl declination Diff distance run edition error EX-MERIDIAN OBSERVATIONS Ex-meridian Tables examples factors taken finding the ship-s H. S. Blackburne Hilaire system hour Hour-angles from Upper IMPROVED SUMNER latitude line of position Long Longitude by chronometer M.T. Green M.T. Sp Marcq St Masters and Mates Mercater chart Meridian Table name the factors Nautical navigation noon Obsd observed altitude Plane Chart plotted position of ship position-line Posn.-line for Plane prime vertical problem Procyon R.A. Sid Redn Reduct1ons Reduction Tables reductions and azimuths Required run in interval second bearing ship-s position Sirius stars stellar navigation Sumner method Table for Hour-angles Tables for Azimuth tion Trade examinations traverse-table true altitude true bearing Upper Meridian writer Zealand