On 22 May your 0437 DR position is LAT 25°18.5'N, LONG 51°18.0'W. You observed an unidentified star bearing 233°T at an observed altitude (Ho) of 29°42.3'. The chronometer reads 07h 40m 40s, and is 03m 24s fast. What star did you observe?

Correct Answer: Option B — Sabik

Computing Greenwhich Hour Angle of Aries and applying the star's sidereal hour angle determines the Local Hour Angle of the body. Entering sight reduction tables with the DR position, intercept, and azimuth matching 233°T positively identifies the star as Sabik.