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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. Prediction and Research Moored Array in the Atlantic

    en.wikipedia.org/wiki/Prediction_and_Research...

    The "Null Island" buoy in 2017. The Prediction and Research Moored Array in the Atlantic (PIRATA) [note 1] is a system of moored observation buoys in the tropical Atlantic Ocean which collect meteorological and oceanographic data. The data collected by the PIRATA array helps scientists to better understand climatic events in the Tropical ...

  4. Natural Earth - Wikipedia

    en.wikipedia.org/wiki/Natural_Earth

    The original authors of the map dataset are Tom Patterson and Nathaniel Vaughn Kelso, but Natural Earth has expanded to be a collaboration of many volunteers and is supported by the North American Cartographic Information Society (NACIS). [2] It is free for public use in any type of project.

  5. Earth-centered, Earth-fixed coordinate system - Wikipedia

    en.wikipedia.org/wiki/Earth-centered,_Earth...

    The Earth-centered, Earth-fixed coordinate system (acronym ECEF), also known as the geocentric coordinate system, is a cartesian spatial reference system that represents locations in the vicinity of the Earth (including its surface, interior, atmosphere, and surrounding outer space) as X, Y, and Z measurements from its center of mass.

  6. Null infinity - Wikipedia

    en.wikipedia.org/wiki/Null_infinity

    For instance, black hole spacetimes are asymptotically flat, and null infinity can be used to characterize radiation in the limit that it travels outward away from the black hole. [5] Null infinity can also be considered in the context of spacetimes which are not necessarily asymptotically flat, such as in the FLRW cosmology. [2]

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  8. Help:Conditional expressions - Wikipedia

    en.wikipedia.org/wiki/Help:Conditional_expressions

    But for any of the values "5", "6" or "7", the output will be the string "in the range 5 to 7". For any other value, or a null value, it will return the string "other". The following example is equivalent to the previous one:

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