On 22 April your 1852 ZT DR position is LAT 23°54.5' N, LONG 117°36.8' W. You observe an unidentified star bearing 129°T at an observed altitude (Ho) of 27°10.0'. The chronometer reads 02h 54m 53s and is 02m 51s fast. What star did you observe?

Correct Answer: Option D — Gienah

Calculate Greenwich Mean Time (GMT) by applying chronometer error to the reading, then determine Greenwich Hour Angle (GHA) Aries and Sidereal Hour Angle (SHA). Using the DR position to find Local Hour Angle (LHA), compare the calculated LHA and Declination against the Nautical Almanac star list to identify Gienah.