On 22 July your 1759 DR position is LAT 24°50.2' S, LONG 05°16.0' E. You observe an unidentified star bearing 293°T at an observed altitude (Ho) of 17°52.8'. The chronometer reads 06h 01m 31s, and is 02m 15s fast. What star did you observe?

Correct Answer: Option B — Regulus

Convert chronometer time to GMT, then determine GHA Aries and the star's SHA. Calculate LHA using the DR longitude. By comparing the calculated LHA and Declination against the Nautical Almanac star list, Regulus is identified as the body matching the observed altitude and bearing.