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 C — 87°E
Antipodal equatorial crossings on a great circle track are separated by 180 degrees of longitude. Subtracting 93°W from 180° results in 87°, reversing the hemisphere to East (87°E), per navigational math standards outlined in Bowditch.
100% Free & Open Access — No daily limits, paywalls, or gated answers on BrightMariner.