A great circle crosses the equator at 93°W. It will also cross the equator at what other longitude?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 87°E
Equatorial intersections of a great circle are separated by 180 degrees of longitude on opposite sides of the globe. Subtracting 93°W from 180° and changing the hemisphere designation yields 87°E, in accordance with spherical navigation principles.
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