On 22 February your 1857 DR position is LAT 23°46.0'S, LONG 93°16.5'E. You observe an unidentified star bearing 150°T at an observed altitude (Ho) of 42°15.0'. The chronometer reads 01h 00m 35s, and is 03m 25s fast. What star did you observe?

Correct Answer: Option C — Avior

Convert chronometer time to GMT and determine the LHA of Aries. By calculating the LHA of the star using the DR longitude, the celestial coordinates (declination and SHA) are derived. Comparing these values against the Nautical Almanac for 22 February identifies Avior as the star matching the observed altitude and bearing.