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aerial computer air almanac air plot aircraft altimeter assumed position body calibrated calibrated airspeed celestial navigation celestial sphere clouds coefficient compass heading conversion angle correction curve D.R. position declination departure desired track destination determined Diff direction drift meter Earth equator error forecast G.C.T. and date gnomonic projection Greenwich meridian ground speed horizon hour angle indicated indicated airspeed interception interpolation latitude line of position Long longitude loop lubber line magnetic heading mean Sun measured Mercator's projection minutes minutes of arc nautical miles navigator obtained on-course parallel plane Polaris pole pressure altitude problem quadrant radio range radius of action relative bearing Required rhumb line rotation sextant signal soft iron Solution square search stars station straight line sub-point surface tables tabulated temperature tion triangle true airspeed true heading vertical zenith Zone