Question 1898Navigation General

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A great circle crosses the equator at 157°W. It will also cross the equator at what other longitude?

A 57°W
B 57°E
C 23°E
D 157°E
AI Explanation

The correct answer is C) 23°E. A great circle is the shortest distance between two points on a sphere, and it will cross the equator at 180 degrees from the initial crossing point. Since the great circle crosses the equator at 157°W, it will also cross the equator at 23°E, which is 180 degrees from 157°W. The other options are incorrect because: A) 57°W is not 180 degrees from 157°W. B) 57°E is not 180 degrees from 157°W. D) 157°E is the same longitude as the initial crossing, not the second crossing point.

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