Sextant — Celestial Nav

Earlier versions worked the hour angle on the wrong side of Greenwich, so sights taken anywhere but longitude 0 plotted in the wrong place. Sorry. This update fixes it and rebuilds the almanac: • Camera sextant: the level check no longer blocks sights above the horizon, and Sun and Moon sights use the centre of the disc you aim at • Sky tab: labels now sit on the bodies they name, and the heading shows where the camera points • Sight reduction tested against U.S. Naval Observatory data: within 0.2' for Sun, Moon, planets and all 58 stars • New almanac: VSOP87 planets, ELP-2000 Moon, star positions with precession and proper motion • Set your assumed position once, or take it from GPS; camera and noon sights use it too • Sextant altitude in degrees and minutes, time to the second • Running fixes: DR legs have a start time and only the run between sights is used • Tap a body on the Sky tab to start a sight on it, with a sextant or the camera • Polaris latitude solved exactly from your sextant reading; noon sight uses your Settings • Sights saved with earlier versions are worked again with the corrected calculation • A new icon