-geodetics-

{ } a. Of or pertaining to geodesy; obtained or determined by the operations of geodesy; engaged in geodesy; geodesic; as, geodetic surveying; geodetic observers. [ 1913 Webster ]

Geodetic line or
Geodetic curve, the shortest line that can be drawn between two points on the elipsoidal surface of the earth; a curve drawn on any given surface so that the osculating plane of the curve at every point shall contain the normal to the surface; the minimum line that can be drawn on any surface between any two points. [ 1913 Webster ]

adv. In a geodetic manner; according to geodesy. [ 1913 Webster ]