On 17 March your 1845 DR position is LAT 25°10.0'N, LONG 66°48.0'W. You observe an unidentified star bearing 077°T at an observed altitude (Ho) of 67°04.4'. The chronometer reads 10h 47m 49s, and is 1m 54s fast. What star did you observe?

Correct Answer: Option C — Pollux

Calculate GHA Aries and LHA Aries from the chronometer time. Determine the star's LHA using the DR longitude. By entering Pub. 229 with the DR latitude and calculated LHA, the observed altitude and bearing match the coordinates for Pollux, consistent with standard celestial navigation reduction procedures for unidentified stars.