On 23 September your 1836 DR position is LAT 25°18'S, LONG 162°36'E. You observe an unidentified star bearing 022°T at an observed altitude (Ho) of 13°16'. The chronometer reads 07h 34m 12s, and is 01m 54s slow. What star did you observe?

Correct Answer: Option D — Deneb

Determine GMT by applying chronometer error to the reading. Extract GHA Aries and the star's Sidereal Hour Angle (SHA) from the Nautical Almanac. Calculate LHA and Declination. Plotting the intercept or comparing the calculated position to the star's coordinates confirms Deneb matches the observed bearing and altitude.