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  2. Null Island - Wikipedia

    en.wikipedia.org/wiki/Null_Island

    Null Island is the location at zero degrees latitude and zero degrees longitude), i.e., where the prime meridian and the equator intersect. Since there is no landmass located at these coordinates, it is not an actual island. The name is often used in mapping software as a placeholder to help find and correct database entries that have ...

  3. 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°. Together, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great circle.

  4. IERS Reference Meridian - Wikipedia

    en.wikipedia.org/wiki/IERS_Reference_Meridian

    The most important reason for the 5.3 seconds of longitude offset between the IERS Reference Meridian and the Airy transit circle is that the observations with the transit circle were based on the local vertical, while the IERS Reference is a geodetic longitude, that is, the plane of the meridian contains the center of mass of the Earth.

  5. Equator - Wikipedia

    en.wikipedia.org/wiki/Equator

    Road sign marking the equator near Nanyuki, Kenya. The latitude of the Earth's equator is, by definition, 0° (zero degrees) of arc.The equator is one of the five notable circles of latitude on Earth; the other four are the two polar circles (the Arctic Circle and the Antarctic Circle) and the two tropical circles (the Tropic of Cancer and the Tropic of Capricorn).

  6. Latitude - Wikipedia

    en.wikipedia.org/wiki/Latitude

    Planes parallel to the equatorial plane intersect the surface in circles of constant latitude; these are the parallels. The Equator has a latitude of 0°, the North Pole has a latitude of 90° North (written 90° N or +90°), and the South Pole has a latitude of 90° South (written 90° S or −90°). The latitude of an arbitrary point is the ...

  7. Longitude - Wikipedia

    en.wikipedia.org/wiki/Longitude

    Lines of latitude appear horizontal with varying curvature in this projection; but are actually circular with different radii. All locations with a given latitude are collectively referred to as a circle of latitude. The equator divides the planet into a Northern Hemisphere and a Southern Hemisphere, and has a latitude of 0°.

  8. Cape Three Points - Wikipedia

    en.wikipedia.org/wiki/Cape_Three_Points

    Nautical chart of Cape Three Points (1869) Cape Three Points is located between the coastal village of Akwidaa and town of Princes Town, Ghana.Cape Three Points is known as the "land nearest nowhere" because it is the land nearest to a location in the sea known as Null Island, which is at 0 latitude and 0 longitude (the distance is about 570 km).

  9. Geodetic coordinates - Wikipedia

    en.wikipedia.org/wiki/Geodetic_coordinates

    Geodetic latitude measures how close to the poles or equator a point is along a meridian, and is represented as an angle from −90° to +90°, where 0° is the equator. The geodetic latitude is the angle between the equatorial plane and a line that is normal to the reference ellipsoid.