Question 1481Navigation General

70% to pass

The magnitude of three stars is indicated. Which star is the brightest?

A Cannot be determined; magnitude indicates size not brightness
B Canopus - 0.9
C Vega + 0.1
D Antares + 1.2
AI Explanation

The correct answer is B) Canopus - 0.9. The magnitude scale is an inverse logarithmic scale, where lower numbers indicate brighter stars. Therefore, Canopus with a magnitude of -0.9 is the brightest of the three stars listed. The other options are incorrect because: A) Magnitude does indicate the brightness of a star, not its size. C) Vega with a magnitude of +0.1 is dimmer than Canopus. D) Antares with a magnitude of +1.2 is the dimmest of the three stars.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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