On 22 April your 1852 DR position is LAT 23°54.5'N, LONG 117°36.8'W. You observe an unidentified star bearing 077°T at an observed altitude (Ho) of 18°58.7'. The chronometer reads 02h 54m 53s, and is 02m 51s fast. What star did you observe?

Correct Answer: Option C — Arcturus

Calculate Greenwich Hour Angle (GHA) and Declination using the Nautical Almanac for the given GMT. Determine Local Hour Angle (LHA) by applying longitude. Compare the calculated LHA and Declination against the star list in the Almanac. Arcturus matches the observed altitude and bearing at the calculated celestial coordinates.