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spherical line

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  • Spherical geometry — is the geometry of the two dimensional surface of a sphere. It is an example of a non Euclidean geometry. Two practical applications of the principles of spherical geometry are navigation and astronomy.In plane geometry the basic concepts are… …   Wikipedia

  • Spherical trigonometry — Spherical triangle Spherical trigonometry is a branch of spherical geometry which deals with polygons (especially triangles) on the sphere and the relationships between the sides and the angles. This is of great importance for calculations in… …   Wikipedia

  • Spherical astronomy — or positional astronomy is the branch of astronomy that is used to determine the location of objects on the celestial sphere, as seen at a particular date, time, and location on the Earth. This is one of the oldest branches of astronomy. It… …   Wikipedia

  • Spherical cow — is a metaphor for highly simplified scientific models of reality. The phrase comes from a joke about theoretical physicists:Milk production at a dairy farm was low so the farmer wrote to the local university, asking help from academia. A… …   Wikipedia

  • Spherical Earth — Medieval artistic representation of a spherical Earth with compartments representing earth, air, and water (c. 1400). The concept of a spherical Earth dates back to ancient Greek philosophy from around the 6th century BC …   Wikipedia

  • Spherical coordinate system — In mathematics, the spherical coordinate system is a coordinate system for representing geometric figures in three dimensions using three coordinates: the radial distance of a point from a fixed origin, the zenith angle from the positive z axis… …   Wikipedia

  • Spherical polyhedron — In mathematics, the surface of a sphere may be divided by line segments into bounded regions, to form a spherical tiling or spherical polyhedron. Much of the theory of symmetrical polyhedra is most conveniently derived in this way.Spherical… …   Wikipedia

  • Spherical coordinates — Coordinate Co*[ o]r di*nate, n. 1. A thing of the same rank with another thing; one two or more persons or things of equal rank, authority, or importance. [1913 Webster] It has neither co[ o]rdinate nor analogon; it is absolutely one. Coleridge.… …   The Collaborative International Dictionary of English

  • Spherical Unit Provided — SuP / Supuration Surnom S.U.P. ou Spherical Unit Provided Pays d’origine  France Valenciennes Genre musical death/doom/ …   Wikipédia en Français

  • Spherical angle — Angle An gle ([a^][ng] g l), n. [F. angle, L. angulus angle, corner; akin to uncus hook, Gr. agky los bent, crooked, angular, a gkos a bend or hollow, AS. angel hook, fish hook, G. angel, and F. anchor.] 1. The inclosed space near the point where …   The Collaborative International Dictionary of English

  • Line element — A line element in mathematics can most generally be thought of as the square of the change in a position vector in an affine space equated to the square of the change of the arc length. An easy way of visualizing this relationship is by… …   Wikipedia

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