On 8 April your evening DR position is LAT 22°16' N, LONG 157°58.3' W. You observe an unidentified star bearing 246°T at an observed altitude (Ho) of 58°45.5'. The chronometer reads 05h 09m 57s, and is 01m 23s slow. What star did you observe?

Correct Answer: Option B — Betelgeuse

Convert chronometer time to GMT to find the LHA of Aries. Using the DR position, calculate the star's computed altitude and azimuth. Comparing the observed bearing of 246°T and altitude of 58°45.5' against the calculated values identifies the star as Betelgeuse, consistent with the Nautical Almanac data.