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60 miles adding or subtracting Air Almanac air navigation altitude and azimuth Antares Arcturus assumed position astronomical triangle azimuth bearing Bowditch—Chap called celestial sphere Chap Chapter chronometer circle of position Corr Cruris D.R. Lat D.R. Latitude D.R. Long D.R. position dead reckoning declination Deneb difference Dschubba earth east or west elevated pole equator equinoc equinoctial example Extract from H.O. Extract from Nautical feet Find the G.C.T. finding the latitude full degree gation geographical position gives height of eye horizon latitude line of position local hour angle longitude meridian angle Miaplacidus moon Nautical Almanac north or south object observed altitude octant plane point of Aries POSITION BY H.O. Position Plotting Sheet practice prime meridian problem real sun References Dutton—Chap right ascension sextant reading Sheet for Line sidereal sight solution solve speed standard compass card stars Table B Table tion tude zenith distance zone