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  2. Area 51 - Wikipedia

    en.wikipedia.org/wiki/Area_51

    Area 51. Coordinates: 37°14′0″N 115°48′30″W. Homey Airport. Near Rachel, Lincoln County, Nevada in United States. A satellite image taken in 2022 captured by Sentinel-2 of ESA showing the base with Groom Lake just to the north-northeast. Homey Airport.

  3. Geographic coordinate system - Wikipedia

    en.wikipedia.org/wiki/Geographic_coordinate_system

    t. e. 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 of the various spatial reference systems that are in use, and forms the basis for most others.

  4. Google Earth - Wikipedia

    en.wikipedia.org/wiki/Google_Earth

    Google Earth is a computer program that renders a 3D representation of Earth based primarily on satellite imagery. The program maps the Earth by superimposing satellite images, aerial photography, and GIS data onto a 3D globe, allowing users to see cities and landscapes from various angles. Users can explore the globe by entering addresses and ...

  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. [1][2 ...

  6. Semipalatinsk Test Site - Wikipedia

    en.wikipedia.org/wiki/Semipalatinsk_Test_Site

    From 1996 to 2012, a secret joint operation of Kazakh, Russian, and American nuclear scientists and engineers secured the waste plutonium in the tunnels of the mountains. [ 5 ] The Semipalatinsk Test Site saw the detonation of the first Soviet atom bomb, and the first air-tested hydrogen bomb.

  7. Hellenic Geodetic Reference System 1987 - Wikipedia

    en.wikipedia.org/wiki/Hellenic_Geodetic...

    The datum of that system was based on the Bessel ellipsoid, with an accurate determination of the geodetic coordinates at the central premises of the National Observatory of Athens 37° 58' 20.1" N - 23° 42' 58.5"E with current Google Earth TM coordinates:37° 58' 20.20" N - 23° 43' 05.36"E and supplemented by an accurately measured azimuth ...

  8. Null Island - Wikipedia

    en.wikipedia.org/wiki/Null_Island

    Null Island is the location at zero degrees latitude and zero degrees longitude (0°N 0°E), 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 ...

  9. Roswell incident - Wikipedia

    en.wikipedia.org/wiki/Roswell_incident

    ABC News radio broadcast on Roswell disc – July 8, 1947. The Roswell incident is a conspiracy theory which alleges that the 1947 crash of a United States Army Air Forces balloon near Roswell, New Mexico was actually caused by an extraterrestrial spacecraft. Operated from the nearby Alamogordo Army Air Field and part of the top secret Project ...