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

Official USCG Answer & Rule Citation

Correct Answer: Option C — 23°E

Equatorial intersections of any great circle occur at exact 180° longitudinal intervals. Subtracting 157°W from 180° leaves 23° and changes the meridian direction from West to East, yielding 23°E per standard navigational calculations in Bowditch.