On 17 March your 1845 DR position is LAT 25°10.0'N, LONG 66°48.0'W. You observe an unidentified star bearing 320°T at an observed altitude (Ho) of 50°02.9'. The chronometer reads 10h 47m 49s, and is 1m 54s fast. What star did you observe?

Correct Answer: Option C — Mirfak

Convert chronometer time to GMT and determine the GHA of Aries. Calculate the LHA of the star using the DR longitude. By comparing the resulting declination and SHA against the Nautical Almanac for 17 March, Mirfak is identified as the star matching the observed altitude and bearing.