Celestial navigation exploits the principle that every measurement taken with a sextant (a 'sight') converts to a line of position on a chart, the intersections of two or more such lines providing a position fix. Use this offline compatible app to plan/enter sights and inspect the resulting lines of position. Features * Realtime computed horizon in panoramic projection. Use for star/planet identification, sight preparation, true bearings etc. * Sight reduction (ephemerides calculated intern