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880:. At time 1, the Sun and a certain distant star are both overhead. At time 2, the planet has rotated 360 degrees and the distant star is overhead again but the Sun is not (1→2 = one stellar day). It is not until a little later, at time 3, that the Sun is overhead again (1→3 = one solar day). (from
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A map of recent volcanic activity and ridge spreading. The areas where NASA GRACE measured gravity to be stronger than the theoretical gravity have a strong correlation with the positions of the volcanic activity and ridge spreading. (from
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The definition of latitude (φ) and longitude (λ) on an ellipsoid of revolution (or spheroid). The graticule spacing is 10 degrees. The latitude is defined as the angle between the normal to the ellipsoid and the equatorial plane. (from
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model, where observed latitudes and magnetic directions are plotted directly into the plane, with a constant scale, as if the Earth were a plane (Portuguese
National Archives of Torre do Tombo, Lisbon). (from
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Gravity at different internal layers of Earth (1 = continental crust, 2 = oceanic crust, 3 = upper mantle, 4 = lower mantle, 5+6 = core, A = crust-mantle boundary) (from
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in Europe, in the beginning of the 15th century, marked the rebirth of scientific cartography, after more than a millennium of stagnation. (from
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1069:. Red shows the areas where gravity is stronger than the smooth, standard value, and blue reveals areas where gravity is weaker (
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A simulated history of Earth's day length, depicting a resonant-stabilizing event throughout the
Precambrian era (from
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and many consider the study of Earth's shape and gravity to be central to that science. It is also a discipline of
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is about 23.4°. It oscillates between 22.1° and 24.5° on a 41,000-year cycle and is currently decreasing. (from
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directly in the field. Image shows mapping of forest structure (position of trees, dead wood and canopy). (from
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and using his second map projection. The translation into Latin and dissemination of
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Gravity measurement devices, pendulum (left) and absolute gravimeter (right) (from
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51:. Please contact these user(s) when you plan to make significant changes.
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Starry circles arc around the south celestial pole, seen overhead at
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Plot of latitude versus tangential speed. The dashed line shows the
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A pre-Mercator nautical chart of 1571, from
Portuguese cartographer
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Visual fix by three bearings plotted on a nautical chart (from
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A plumb bob determines the local vertical direction (from
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example. The dot-dash line denotes typical airliner
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and terrestrial geodetic techniques, and relying on
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693:Height measurement using satellite altimetry (from
2863:Manually maintained portal pages from January 2023
264:, can be studied by designing global and national
1167:Deviation of day length from SI-based day (from
1567:Global plate tectonic movement using GPS (from
16:Knowledge portal for content related to Geodesy
2442:sister projects provide more on this subject:
1629:) and mean Earth radii as defined in the 1984
1217:map of the British Isles from a manuscript of
961:Initial acquisition of GPS signal in 2D (from
77:before making major changes. Learn how to
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1065:of an idealized, smooth Earth, the so-called
8:
1483:Small section of an orienteering map (from
562:and its tracing, 6th–4th century BCE (from
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1544:Principles of geolocation using GPS (from
1726:2D grid for elliptical coordinates (from
309:Refresh with new selections below (purge)
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2351:
1752:- a mathematical representation of the
750:(10000 vertical scaling factor). (from
662:Variations in the gravity field of the
322:
307:
183:GPS Block II-F satellite in Earth orbit
79:update the maintenance information here
1144:of the stars as Earth rotates. (from
1061:mission, showing deviations from the
7:
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1429:Block IIA satellite orbits over the
475:in 1154. South is at the top. (from
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1295:Deep Space Climate Observatory
280:. Geodetic job titles include
1:
1973:Surveying and geodesy markers
1922:Geographic coordinate systems
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380:An artist's rendering of the
342:
61:by an editor, and are needed.
2006:Satellite navigation systems
1699:is shown as viewed from the
1190:A relative gravimeter (from
831:A medieval depiction of the
716:Geodetic control mark (from
2243:Precession of the equinoxes
1683:), rotation axis, plane of
1293:Earth's rotation imaged by
773:Areal distortion caused by
2904:
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224:planetary geodesy
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