لقطات فيديو لمبادئ الهندسة من كسارة متنقلة
الهندسة الكروية - GitHub Pages. A great-circle arc, on the sphere, is the analogue of a straight line, on the plane. Where two such arcs intersect, we can define the spherical angle either as angle between the tangents to the two arcs, at the point of intersection, or as the angle between the planes of the two great circles where they intersect at the centre of the sphere. .