On 8 April while taking observations for an evening fix, you observe an unidentified star bearing 250.7°T at an observed altitude of 51°44.8'. Your DR position at the time of the sight was LAT 22°16.0' N, LONG 157°58.3' W. The chronometer reads 05h 09m 57s and is 01m 23s slow. What star did you observe?
Official USCG Answer & Rule Citation
Correct Answer: Option D — Bellatrix
Convert chronometer time to GMT and determine the GHA Aries and SHA of the star. Calculate the LHA and use Pub. 229 to find the Hc and Zn. Matching the observed altitude of 51°44.8' and bearing of 250.7°T against the calculated values confirms the star is Bellatrix.
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