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Alternating Current Altitude of body angle opposite Astronomical Navigation azimuth B.Sc Hons Book bubble sextant calculated Circle course Co-Alt Co-Lat course angle D.R. Lat D.R. Latitude D.R. Long D.R. Longitude D.R. position D.Sc d/Long Data needed decimal point declination Definitions and Formulae diagram digits in front E. J. Holmyard east equator Find Approximate FIND LONGITUDE Fourth Edition G.D. at place G.M.T. at place G.M.T. of passage Greenwich Meridian Haversine Formula Heston Hour Angle hypotenuse included angle Index Error less than 90 Log Cosec Log Hav logarithmic number M.Eng M.Sc Magnetic Variation Mathematics meridian altitude mins moon Nautical Almanac nautical miles northern hemisphere observer's meridian ordinary number Perren Maycock Ph.D Polar Distance Pole position line Practical Revised Rhumb Line Second Edition secs sextant side opposite Sine Formula Slide Rule SPHERICAL TRIANGLES star subtracted sun for G.M.T. sun's Third Edition True Altitude Vertex volumes Zenith Distance