tiles


Note:  Do not rely on this information. It is very old.

Great Circle

Great Circle of a sphere is a curve determined on its surface by any plane passing through its centre. It is the greatest circle that can be drawn on the surface of the sphere; all others are similarly produced by plane sections, but are of smaller size. The shortest line drawn along the snrfaco oonneoting any two points on it is an arc of the great circle passing through them. Hence the importance of great circle sailing in navigation. [Sphere.]