page_title: Riemannian circle
hierarchical_section_title: Riemannian circle
context_page_description: In metric space theory and Riemannian geometry, the Riemannian circle is a great circle equipped with its great-circle distance. It is the circle equipped with its intrinsic Riemannian metric of a compact one-dimensional manifold of total length 2π, or the extrinsic metric obtained by restriction of the intrinsic metric on the sphere, as opposed to the extrinsic metric obtained by restriction of the Euclidean metric to the unit circle in the plane. Thus, the distance between a pair of points is defined to be the length of the shorter of the two arcs into which the circle is partitioned by the two points.
  It is named after German mathematician Bernhard Riemann.
context_section_description: In metric space theory and Riemannian geometry, the Riemannian circle is a great circle equipped with its great-circle distance. It is the circle equipped with its intrinsic Riemannian metric of a compact one-dimensional manifold of total length 2π, or the extrinsic metric obtained by restriction of the intrinsic metric on the sphere, as opposed to the extrinsic metric obtained by restriction of the Euclidean metric to the unit circle in the plane.  Thus, the distance between a pair of points is defined to be the length of the shorter of the two arcs into which the circle is partitioned by the two points.
  It is named after German mathematician Bernhard Riemann.
caption: A great circle divides the sphere in two equal hemispheres
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