On 22 March your 1834 DR position is LAT 26°13.5'S, LONG 108°36.5'W. You observe an unidentified star bearing 315°T at an observed altitude (Ho) of 66°01.2'. The chronometer reads 01h 32m 37s, and is 01m 50s slow. What star did you observe?

Correct Answer: Option D — Rigel

Convert chronometer time to GMT. Extract GHA Aries and SHA from the Nautical Almanac to determine the star's LHA and Declination. Comparing these values against the star list for 22 March confirms Rigel, as its celestial coordinates match the observed altitude and bearing at the DR position.