On 8 April your evening DR position is LAT 22°16.0' N, LONG 157°58.3' W. You observe an unidentified star bearing 238°T at an observed altitude (Ho) of 50°02.7'. The chronometer reads 05h 09m 57s, and is 01m 23s slow. What star did you observe?

Correct Answer: Option C — Alnilam

Determine GMT from the chronometer and find the star's GHA and Declination. Using the DR position, calculate the Hc and Zn via Pub. 229. The intersection of the observed altitude of 50°02.7' and the bearing of 238°T aligns with the coordinates for Alnilam in the Nautical Almanac.