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  2. Nadir - Wikipedia

    en.wikipedia.org/wiki/Nadir

    Nadir also refers to the downward-facing viewing geometry of an orbiting satellite, [2] such as is employed during remote sensing of the atmosphere, as well as when an astronaut faces the Earth while performing a spacewalk. A nadir image is a satellite image or aerial photo of the Earth taken vertically.

  3. Nadir (topography) - Wikipedia

    en.wikipedia.org/wiki/Nadir_(topography)

    In topography, a nadir is a point on a surface that is lower in elevation than all points immediately adjacent to it. [1] Mathematically , a nadir is a local minimum of elevation. A nadir may be the lowest point of a dry basin or depression , or the deepest point of a body of water or ice .

  4. Zenith - Wikipedia

    en.wikipedia.org/wiki/Zenith

    The astronomical meridian is also determined by the zenith, and is defined as a circle on the celestial sphere that passes through the zenith, nadir, and the celestial poles. A zenith telescope is a type of telescope designed to point straight up at or near the zenith, and used for precision measurement of star positions, to simplify telescope ...

  5. Side looking airborne radar - Wikipedia

    en.wikipedia.org/wiki/Side_looking_airborne_radar

    Definition of angles in the vertical plane of SLAR Geometry of an SLAR SLAR radar at ILA Berlin Air Show. Side-looking airborne radar (SLAR) is an aircraft, [1] or satellite-mounted imaging radar pointing perpendicular to the direction of flight (hence side-looking). [2] A squinted (nonperpendicular) mode is also possible.

  6. Nadir (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Nadir_(disambiguation)

    The nadir is a low or downward point of reference. Nadir may also refer to: Nadir (name), a surname and given name; Nadir (topography), a point of lowest local elevation; Nadir (astronomy), the point directly underneath a celestial observer; Nadir (web portal), a German web portal; Nadir, U.S. Virgin Islands, a settlement

  7. Talk:Nadir - Wikipedia

    en.wikipedia.org/wiki/Talk:Nadir

    Nadir comes from ottoman empire (old turkish) with the meaning of "down". Zenith comes from roman empire (latin) with the meaning of "up". Nadir and Zenith are 2 directions that they can help people to orient themselves. Attention!!! North Pole and South Pole with Nadir and Zenith are a total differention. Poles are points and N&Z are directions.

  8. File:Nadir Viewing Geometry.svg - Wikipedia

    en.wikipedia.org/.../File:Nadir_Viewing_Geometry.svg

    Date/Time Thumbnail Dimensions User Comment; current: 16:08, 28 July 2024: 512 × 371 (4 KB): Sertion: Clean up artifacts from the trace: 05:24, 9 January 2016: 469 × 339 (19 KB): PlanetUser

  9. Mathematics education in the United States - Wikipedia

    en.wikipedia.org/wiki/Mathematics_education_in...

    This remains largely true today, with Geometry as a proof-based high-school math class. On the other hand, many countries around the world from Israel to Italy teach mathematics according to what Americans call an integrated curriculum , familiarizing students with various aspects of calculus and prerequisites throughout secondary school.