A great circle crosses the equator at 17°W. It will also cross the equator at what other longitude?
Official USCG Answer & Rule Citation
Correct Answer: Option C — 163°E
Antipodal points on the equator lie exactly 180 degrees apart. Applying this to 17°W (180° minus 17°) and converting the hemisphere yields 163°E, fulfilling the symmetric geometric requirements of great circle navigation outlined in Bowditch.
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