A great circle crosses the equator at 127°W. It will also cross the equator at what other longitude?

Correct Answer: Option C — 53°E

Because a great circle is a planar slice through the Earth's center, its equatorial intersections are antipodal. For 127°W, the opposite meridian is found by subtracting from 180°, resulting in 53°E, adhering to standard Bowditch great-circle geometry rules.