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Groupe De Recherches En Géodésie Spatiale
The 'Spatial Geodesy Research Group''(french: Groupe de Recherche de Géodésie Spatiale, GRGS) is a French group established to advance space geodesy. It is composed of ten public bodies (CNES, IGN, INSU, SHOM, Bureau des longitudes, Observatoire de Paris, Observatoire Midi-Pyrénées, Observatoire de la Côte d'Azur, Université de la Polynésie française, ESGT du CNAM) providing their researchers, engineers, technicians, administrative staff (more than 100 people) and the appropriate research environment.. The GRGS, spread over the whole of France (Grasse, Toulouse, Paris, Brest, Tahiti, Le Mans), is structured as a real laboratory, with a Steering Committee, a Scientific Directorate and its Scientific Council, an Office, a supported Evaluation Committee on the sections of the CNRS, and an Executive Director. The GRGS has organized summer schools every two years in the premises of the ENSG in Forcalquier, and each year various scientific days, in order to facilitate the p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space Geodesy
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Space geodesy is geodesy by means of sources external to Earth, mainly artificial satellites (in satellite geodesy) but also quasars (in very-long-baseline interferometry, VLBI), visible stars (in stellar triangulation), and the retroreflectors on the Moon (in lunar laser ranging, LLR). See also *Astronomical geodesy Geodesy Geodesy Geodesy ( ) is the Earth science of accurately measuring and understanding Earth's figure (geometric shape and size), orientation in space, and gravity. The field also incorporates studies of how these properties change over time and equivale ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geodesic System
In geometry, a geodesic () is a curve representing in some sense the shortest path (arc (geometry), arc) between two points in a differential geometry of surfaces, surface, or more generally in a Riemannian manifold. The term also has meaning in any differentiable manifold with a connection (mathematics), connection. It is a generalization of the notion of a "Line (geometry), straight line". The noun ''wikt:geodesic, geodesic'' and the adjective ''wikt:geodetic, geodetic'' come from ''geodesy'', the science of measuring the size and shape of Earth, though many of the underlying principles can be applied to any Ellipsoidal geodesic, ellipsoidal geometry. In the original sense, a geodesic was the shortest route between two points on the Earth's Planetary surface, surface. For a spherical Earth, it is a line segment, segment of a great circle (see also great-circle distance). The term has since been generalized to more abstract mathematical spaces; for example, in graph theory, on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Celestial Reference System
The International Celestial Reference System (ICRS) is the current standard celestial reference system adopted by the International Astronomical Union (IAU). Its origin is at the barycenter of the Solar System, with axes that are intended to "show no global rotation with respect to a set of distant extragalactic objects". This fixed reference system differs from previous reference systems, which had been based on Catalogues of Fundamental Stars that had published the positions of stars based on direct "observations of heir equatorial coordinates, right ascension and declination" and had adopted as "privileged axes ... the mean equator and the dynamical equinox" at a particular date and time. The International Celestial Reference Frame (ICRF) is a realization of the International Celestial Reference System using reference celestial sources observed at radio wavelengths. In the context of the ICRS, a reference ''frame'' (RF) is the physical realization of a reference ''system,'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geodesy
Geodesy ( ) is the Earth science of accurately measuring and understanding Earth's figure (geometric shape and size), orientation in space, and gravity. The field also incorporates studies of how these properties change over time and equivalent measurements for other planets (known as '' planetary geodesy''). Geodynamical phenomena, including crustal motion, tides and polar motion, can be studied by designing global and national control networks, applying space geodesy and terrestrial geodetic techniques and relying on datums and coordinate systems. The job title is geodesist or geodetic surveyor. History Definition The word geodesy comes from the Ancient Greek word ''geodaisia'' (literally, "division of Earth"). It is primarily concerned with positioning within the temporally varying gravitational field. Geodesy in the German-speaking world is divided into "higher geodesy" ( or ), which is concerned with measuring Earth on the global scale, and "practical geodes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Starlette And Stella
Starlette (''Satellite de taille adaptée avec réflecteurs laser pour les études de la terre'', or ) and Stella are nearly identical French geodetic and geophysical satellites. Starlette was launched on 6 February 1975 and Stella on 26 September 1993. Starlette was the first passive laser satellite developed. Background Starlette's development dates back to at least 1972, when scientists at the Centre national d'études spatiales (CNES) were trying to determine a payload for the upcoming first flight of the new Diamant BP4 rocket. After consulting with the Smithsonian Astrophysical Observatory, CNES scientists decided to create a small geodetic satellite optimized for tracking by laser ranging. The project was approved within a few months after a feasibility study by the French atomic agency CEA determined the dense uranium core could be made nearly non-radioactive by using depleted uranium. The Groupe de recherches en géodésie spatiale (GRGS; Space Geodesy Research Grou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conservatoire National Des Arts Et Métiers
A music school is an educational institution specialized in the study, training, and research of music. Such an institution can also be known as a school of music, music academy, music faculty, college of music, music department (of a larger institution), conservatory, conservatorium or conservatoire ( , ). Instruction consists of training in the performance of musical instruments, singing, musical composition, conducting, musicianship, as well as academic and research fields such as musicology, music history and music theory. Music instruction can be provided within the compulsory general education system, or within specialized children's music schools such as the Purcell School. Elementary-school children can access music instruction also in after-school institutions such as music academies or music schools. In Venezuela El Sistema of youth orchestras provides free after-school instrumental instruction through music schools called ''núcleos''. The term "music school" can a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Université De La Polynésie Française
The University of French Polynesia (french: Université de la Polynésie française) is a French university located in Puna'auia, French Polynesia. History Created by a decree of May 29, 1987, the university was originally called French Pacific University and was split between two sites, one located in New Caledonia (now University of New Caledonia) and the other in Tahiti. The administrative headquarters of the university was in Papeete. Both centers have become autonomous with the Decree No. 99-445 of 31 May 1999. The University of French Polynesia is based in Outumaoro, Punaauia, Tahiti. The number of students is growing steadily, with a significant increase of over 60% since 1999, and so has the range of course offerings. The University of French Polynesia is often the talk of local newspapers, especially because of its proactive policy for the employability of its graduates. One can mention, among others, the Employers' Forum, the sponsorship of class valedictorians by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CNES
The (CNES; French: ''Centre national d'études spatiales'') is the French government space agency (administratively, a "public administration with industrial and commercial purpose"). Its headquarters are located in central Paris and it is under the supervision of the French Ministries of Defence and Research. It operates from the Toulouse Space Centre and the Guiana Space Centre, but also has payloads launched from space centres operated by other countries. The president of CNES is Philippe Baptiste. CNES is a member of Institute of Space, its Applications and Technologies. It is Europe's largest and most important national organization of its type. History CNES was established under President Charles de Gaulle in 1961. It is the world's third oldest space agency, after the Soviet space program (Russia), and NASA (United States). CNES was responsible for the training of French astronauts, until the last active CNES astronauts transferred to the European Space Agency in 200 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
