The GHA of the first point of Aries is 315° and the GHA of a planet is 150°. What is the right ascension of the planet?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 11 hours
Right ascension is measured eastward from the first point of Aries to the body's meridian. It is calculated by subtracting the body's GHA from Aries' GHA (RA = GHA_Aries - GHA_Body). Converting 315° minus 150° gives 165°, and dividing by 15 degrees per hour yields 11 hours.
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