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École pratique des hautes études

1868 establishments in FranceEducational institutions established in 1868Grands établissementsSchools in ParisUniversity of Paris
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The École pratique des hautes études (French pronunciation: ​[ekɔl pʁatik de ot.z‿etyd]), abbreviated EPHE, is a Grand Établissement in Paris, France. It is highly selective, and counted among France's most prestigious research and higher education institutions. It is a constituent college of the elite Université PSL (together with ENS Ulm, Paris Dauphine or Ecole des Mines). Its degrees in religious studies and in history count among the best in the world. Closely linked to École française d'Extrême-Orient and Institut français du Proche-Orient, EPHE has formed continuously world-class experts in Asian and Islamic studies and among them investment bankers, diplomat and military officers specialized in these areas. Particularly, leading researchers in military strategy have taught in EPHE for more than a century, such as, by example, Hervé Coutau-Bégarie. Moreover, famous researchers in natural sciences (especially neurosciences and chemistry) teach and taught in EPHE (among them Jean Baptiste Charcot and Marcellin Berthelot). Highly regarded for its top level in both natural and human sciences, EPHE has relations and exchange programs with world-renowned institutions such as Cambridge, Princeton, and Al-Azhar.

Excerpt from the Wikipedia article École pratique des hautes études (License: CC BY-SA 3.0, Authors, Images).

École pratique des hautes études
Rue Ferrus, Paris Quartier du Parc-de-Montsouris (Paris)

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N 48.8311 ° E 2.34 °
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Rue Ferrus
75014 Paris, Quartier du Parc-de-Montsouris (Paris)
Ile-de-France, France
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Arago telescope
Arago telescope

Arago telescope (Lunette Arago) is a 38 cm (15 inch) aperture refracting telescope at Paris Observatory, installed in 1857. Francois Arago ordered this telescope from the telescope making firm Lebreours in 1839, and after a protracted development was completed by 1855. The name Lunette Arago (Arago refractor) is a modern name for the telescope, and other large refractor of Paris observatory, is the one at Meudon. It has gone by a variety of names having to do with various aspects of the telescope, such as its aperture, or location on the East tower of the Paris observatory, or its equatorial mount made by Brunner. In one journal report it was called the 'east equatorial' for example, in another instance '38 cm refractor'. In French language it has been called the La lunette équatoriale de 38 cm de l'Observatoire de Paris.The telescope had an objective lens 14 pouces across, which is a name for Paris Inches; this works out to about 38 cm (14.96 (usually rounded to 15) English inches). The original objective was completed by Lerebours by 1844. The equatorial mounting made by Brunner was delivered in 1859. The clock drive for the equatorial was made by Breguet.The equatorial mounting was not ordered until early 1850s, after the new dome work, completed in 1847, had been finished. The floor of the dome was also designed to move. The telescope was installed in the new east dome built for it, on top of the Paris Observatory building.There was some issue with the lens, and it was re-polished in 1874. In the early 1880s a new objective lens was installed, made by the Henry Brothers. Also the dome and mounting were modified at that time, including replacing an earlier wooden tube with one of iron.The telescope is known to have been used for observing double stars, minor planets (asteroids), and also some photographic astronomy in the late 19th century. When it made its debut in the late 1850s, it was noted for its 38 cm (15 inch) Lerebours objective, Brunner mount, and there was some discussion over its use for astro photography.This telescope is noted for its photometric observations of the Galilean Satellites (Io, Europa, Callisto, and Ganymede) in the 1880s. Corunu and Obrecht would photometrically detect the eclipses of Jupiter by its moons at Paris Observatory.Some of the photometers it was used with included different types, such as polarizing photometers. Some examples of photometers for the telescope in the late 19th and early 20th century include Photometers R, T, W, and H. Photometer R was a roughly half meter long brass tube, 5 cm in diameter with two prisms inside. The prisms were made of quartz. Photometer T on the other hand had a drum 12.5 cm in diameter and over 17 cm long.On June 23, 1878 the East Equatorial of Paris Observatory (the Arago) was first used for photometric detection of an eclipse of Jupiter's moons. The telescope was also used to photometrically study double stars with Photometer H.A Nicol prism was used at the eyepiece for certain instrumentation setups.Over 1800 double stars were observed with the 38 cm of Paris Obs. between 1966 and 1971.The telescope was used for PHEMU85 . PHEMU85 was international astronomical collaboration to view the moons of Jupiter in 1985.The Paris Observatory building was significantly modified to support the weight of the new telescope and dome, and modifications included a new cement support structure and a steel lattice to hold the new telescope.