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  2. Geodetic coordinates - Wikipedia

    en.wikipedia.org/wiki/Geodetic_coordinates

    Geodetic latitude and geocentric latitude have different definitions. Geodetic latitude is defined as the angle between the equatorial plane and the surface normal at a point on the ellipsoid, whereas geocentric latitude is defined as the angle between the equatorial plane and a radial line connecting the centre of the ellipsoid to a point on the surface (see figure).

  3. 98th meridian west - Wikipedia

    en.wikipedia.org/wiki/98th_meridian_west

    The meridian 98° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole. The 98th meridian west forms a great circle with the 82nd meridian east.

  4. Geographic coordinate system - Wikipedia

    en.wikipedia.org/wiki/Geographic_coordinate_system

    A geographic coordinate system (GCS) is a spherical or geodetic coordinate system for measuring and communicating positions directly on Earth as latitude and longitude. [1] It is the simplest, oldest and most widely used type of the various spatial reference systems that are in use, and forms the basis for most others.

  5. ISO 6709 - Wikipedia

    en.wikipedia.org/wiki/ISO_6709

    ISO 6709, Standard representation of geographic point location by coordinates, is the international standard for representation of latitude, longitude and altitude for geographic point locations. The first edition ( ISO 6709:1983 ) was developed by ISO/IEC JTC 1 /SC 32.

  6. Longitude - Wikipedia

    en.wikipedia.org/wiki/Longitude

    Length of one degree (black), minute (blue) and second (red) of latitude and longitude in metric (upper half) and imperial units (lower half) at a given latitude (vertical axis) in WGS84. For example, the green arrows show that Donetsk (green circle) at 48°N has a Δ long of 74.63 km/° (1.244 km/min, 20.73 m/sec etc) and a Δ lat of 111.2 km ...

  7. Geographical distance - Wikipedia

    en.wikipedia.org/wiki/Geographical_distance

    Hence, the above equations for delta latitude/longitude ... 0 North 0 West to 40 North 120 West, 12.6 meters 0N 0W to 40N 60W, 6.6 meters 40N 0W to 40N 60W, 0.85 meter.

  8. Prime meridian - Wikipedia

    en.wikipedia.org/wiki/Prime_meridian

    A prime meridian is an arbitrarily chosen meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. On a spheroid, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great ellipse.

  9. 96th meridian west - Wikipedia

    en.wikipedia.org/wiki/96th_meridian_west

    The meridian 96° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Gulf of Mexico, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole. The 96th meridian west forms a great circle with the 84th meridian east.