On a curved surface, however, only one of these two properties can be satisfied: the first, by a great circle; the second, by a rhumb line. These two solutions are analyzed, compared, and applied to the direction-facing problem.doi:10.1080/00221340208978464LevinaDaniel Z....
The direction of Mecca from any point on the globe is determined by a compass around which the principal places are inscribed. An attached plate enables the required direction to be traced on it for reference. A support plate (2) provides support for a magnetic compass (3) around which are...