Question 1901Navigation General

70% to pass

A great circle will intersect the equator at how many degrees of longitude apart?

A 0°
B 180°
C 90°
D 45°
AI Explanation

The correct answer is B) 180°. A great circle is the shortest distance between two points on a sphere, and it always intersects the equator at 90° angles. Since the equator is a complete circle around the Earth, a great circle will intersect the equator at two points that are 180° of longitude apart. The other options are incorrect because: A) 0° would not be a great circle, C) 90° would be the distance between the poles, and D) 45° is not the correct angular separation for a great circle.

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