A great circle crosses the equator at 162°E. It will also cross the equator at what other longitude?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 18°W
Great circles are symmetrical ellipses intersecting the equator at antipodal points exactly 180 degrees apart. Subtracting or adding 180° to 162°E yields 18°W after crossing the 180th meridian, maintaining the geometric antipode required by navigational spheroid models.
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