Question 1895Navigation General

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A great circle crosses the equator at 173°E. It will also cross the equator at what other longitude?

A 173°W
B 73°E
C 7°W
D 73°W
AI Explanation

The correct answer is C) 7°W. A great circle is the largest circle that can be drawn on the surface of a sphere, and it always crosses the equator at exactly two points that are 180 degrees apart in longitude. Since the given great circle crosses the equator at 173°E, the other point where it crosses the equator must be 180 degrees away, which is 7°W. The other options are incorrect because: A) 173°W is the same longitude as 173°E, which is already given. B) 73°E is not 180 degrees away from 173°E. D) 73°W is not 180 degrees away from 173°E.

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