On 13 September your 1830 ZT DR position was LAT 23°03'S, LONG 105°16'E when you observed a faint unidentifiable star through a hole in the clouds. The star bore 265.0°T at a sextant altitude (hs) of 62°25.4'. The chronometer read 11h 24m 39s and is 5m 08s slow. The index error is 1.0' off the arc, and the height of eye is 52 feet. What star did you observe?

Question

On 13 September your 1830 ZT DR position was LAT 23&deg;03'S, LONG 105&deg;16'E when you observed a faint unidentifiable star through a hole in the clouds. The star bore 265.0&deg;T at a sextant altitude (hs) of 62&deg;25.4'. The chronometer read 11h 24m 39s and is 5m 08s slow. The index error is 1.0' off the arc, and the height of eye is 52 feet. What star did you observe?

Accepted Answer

Option C: Dschubba. Correct the sextant altitude for index error, dip, and refraction to determine Ho. Calculate UTC, GHA Aries, and SHA. Compute LHA and Declination. The resulting celestial coordinates match Dschubba, following the rigorous sight reduction and identification steps required for professional maritime navigation and USCG licensing examinations.