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from https://en.wikipedia.org/wiki/Geodesic . . . In geometry, a geodesic (/ˌdʒiː.əˈdɛsɪk, -oʊ-, -ˈdiːsɪk, -zɪk/)[1][2] is commonly a curve representing in some sense the shortest[a] path (arc) between two points in a surface, or more generally in a Riemannian manifold. The term also has meaning in any differentiable manifold with a connection. It is a generalization of the notion of a „straight line„. The noun geodesic[b] and the adjective geodetic[c] come from geodesy, the science of measuring […]