On 12 June your 1845 DR position is LAT 21°47'N, LONG 46°52'W when you observe a faint unidentifiable star through a break in the clouds. The star bears 162°T at a sextant altitude (hs) of 28°36.5'. The index error is 0.5'on the arc, and the height of eye is 45 feet. The chronometer reads 09h 43m 27s, and the chronometer error is 1m 46s slow. What star did you observe?

Question

Accepted Answer

Option C: Iota Centauri. Determine Greenwich Hour Angle (GHA) of Aries and apply Greenwich Mean Time (GMT) to find the star's Local Hour Angle (LHA). Using assumed position coordinates, compute calculated altitude and azimuth via standard intercept formulas in Bowditch to match sights with Iota Centauri.