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  2. Map projection - Wikipedia

    en.wikipedia.org/wiki/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. [ 1][ 2][ 3] In a map projection, coordinates, often expressed as latitude and longitude, of locations from the surface of the globe are transformed to coordinates on a plane. [ 4][ 5 ...

  3. World map - Wikipedia

    en.wikipedia.org/wiki/World_map

    World map. A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensional surface of the Earth. While this is true of any map, these distortions reach extremes in a world map.

  4. Geographical distance - Wikipedia

    en.wikipedia.org/wiki/Geographical_distance

    Geographical distance or geodetic distance is the distance measured along the surface of the Earth, or the shortest arch length. The formulae in this article calculate distances between points which are defined by geographical coordinates in terms of latitude and longitude. This distance is an element in solving the second (inverse) geodetic ...

  5. Geographical centre of Earth - Wikipedia

    en.wikipedia.org/wiki/Geographical_centre_of_Earth

    The geographical centre of Earth is the geometric centre of all land surfaces on Earth. Geometrically defined it is the centroid of all land surfaces within the two dimensions of the Geoid surface which approximates the Earth's outer shape. The term centre of minimum distance[ 1] specifies the concept more precisely as the domain is the sphere ...

  6. Geopositioning - Wikipedia

    en.wikipedia.org/wiki/Geopositioning

    Geopositioning is the process of determining or estimating the geographic position of an object. [ 1] Geopositioning yields a set of geographic coordinates (such as latitude and longitude) in a given map datum; positions may also be expressed as a bearing and range from a known landmark. In turn, positions can determine a meaningful location ...

  7. List of nearest stars - Wikipedia

    en.wikipedia.org/wiki/List_of_nearest_stars

    A radar map of the distances ( ) and positions ( ) of all known stellar bodies or systems within 9 light years (ly) (for within 12 ly see this map). Their distances are entered outward from the Sun (Sol) between concentric circles, each representing one ly, and arranged clockwise in hours of right ascension. The position marks are entered ...

  8. Geography of Washington, D.C. - Wikipedia

    en.wikipedia.org/wiki/Geography_of_Washington,_D.C.

    Map showing the location of Washington, D.C. in relation to its bordering states of Maryland and Virginia Washington, D.C. is located in the Mid-Atlantic region of the United States at 38°53′42″N 77°02′11″W  /  38.89500°N 77.03639°W  / 38.89500; -77.03639 , the coordinates of the Zero Milestone , on The Ellipse

  9. Gene mapping - Wikipedia

    en.wikipedia.org/wiki/Gene_mapping

    Gene mapping or genome mapping describes the methods used to identify the location of a gene on a chromosome and the distances between genes. [ 2][ 3] Gene mapping can also describe the distances between different sites within a gene. The essence of all genome mapping is to place a collection of molecular markers onto their respective positions ...

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