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  2. Stereographic projection - Wikipedia

    en.wikipedia.org/wiki/Stereographic_projection

    Specifically, stereographic projection from the north pole (0,1) onto the x-axis gives a one-to-one correspondence between the rational number points (x, y) on the unit circle (with y ≠ 1) and the rational points of the x-axis. If (⁠ m / n ⁠, 0) is a rational point on the x-axis, then its inverse stereographic projection is the point

  3. Peirce quincuncial projection - Wikipedia

    en.wikipedia.org/wiki/Peirce_quincuncial_projection

    The maturation of complex analysis led to general techniques for conformal mapping, where points of a flat surface are handled as numbers on the complex plane.While working at the United States Coast and Geodetic Survey, the American philosopher Charles Sanders Peirce published his projection in 1879, [2] having been inspired by H. A. Schwarz's 1869 conformal transformation of a circle onto a ...

  4. List of map projections - Wikipedia

    en.wikipedia.org/wiki/List_of_map_projections

    Projects the globe onto eight octants (Reuleaux triangles) with no meridians and no parallels. 1909 Cahill's butterfly map: Polyhedral Compromise Bernard Joseph Stanislaus Cahill: Projects the globe onto an octahedron with symmetrical components and contiguous landmasses that may be displayed in various arrangements. 1975 Cahill–Keyes projection

  5. Spherical circle - Wikipedia

    en.wikipedia.org/wiki/Spherical_circle

    If the sphere is isometrically embedded in Euclidean space, the sphere's intersection with a plane is a circle, which can be interpreted extrinsically to the sphere as a Euclidean circle: a locus of points in the plane at a constant Euclidean distance (the extrinsic radius) from a point in the plane (the extrinsic center). A great circle lies ...

  6. Gnomonic projection - Wikipedia

    en.wikipedia.org/wiki/Gnomonic_projection

    Gnomonic projection of a portion of the north hemisphere centered on the geographic North Pole The gnomonic projection with Tissot's indicatrix of deformation. A gnomonic projection, also known as a central projection or rectilinear projection, is a perspective projection of a sphere, with center of projection at the sphere's center, onto any plane not passing through the center, most commonly ...

  7. n-sphere - Wikipedia

    en.wikipedia.org/wiki/N-sphere

    The stereographic projection maps the ⁠ ⁠-sphere onto ⁠ ⁠-space with a single adjoined point at infinity; under the metric thereby defined, {} is a model for the ⁠ ⁠-sphere. In the more general setting of topology , any topological space that is homeomorphic to the unit ⁠ n {\displaystyle n} ⁠ -sphere is called an ⁠ n ...

  8. Orthographic map projection - Wikipedia

    en.wikipedia.org/wiki/Orthographic_map_projection

    They are written in terms of longitude (λ) and latitude (φ) on the sphere. Define the radius of the sphere R and the center point (and origin) of the projection (λ 0, φ 0). The equations for the orthographic projection onto the (x, y) tangent plane reduce to the following: [1]

  9. Map projection - Wikipedia

    en.wikipedia.org/wiki/Map_projection

    A medieval depiction of the Ecumene (1482, Johannes Schnitzer, engraver), constructed after the coordinates in Ptolemy's Geography and using his second map projection. In cartography, a map projection is any of a broad set of transformations employed to represent the curved two-dimensional surface of a globe on a plane.

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