On 22 April your 1852 DR position is LAT 23°54.5'N, LONG 117°36.8'W. You observe an unidentified star bearing 259°T at an observed altitude (Ho) of 41°15.2'. The chronometer reads 02h 54m 53s, and is 02m 51s fast. What star did you observe?

Correct Answer: Option C — Betelgeuse

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. Comparing these values to the star list confirms Betelgeuse, as its position aligns with the observed altitude and bearing from the DR position.