Port-Royal Abbey, Paris

Port-Royal is a French railway station on the RER B line in Paris. It is located in the 5th arrondissement, not far from its tripoint border with the 6th and 14th arrondissements. It is named after Port-Royal Abbey, Paris.

Bal Bullier was a ballroom in Paris, France, created by François Bullier in the mid-nineteenth century.

On 3 December 1996 an IED detonated on the southbound tracks of the Port-Royal Réseau Express Régional (RER) station in Paris, France. Four people were killed in the bombing: two French citizens, a Moroccan and a Canadian.Following the bombing, French officials activated the "Vigipirate" nationwide security plan drawn up a year earlier in the wake of a series of bombings by the Armed Islamic Group of Algeria (GIA). The plan included police and army patrols in sensitive public areas and spot checks across the country.Jean-Louis Bruguière and Jean-François Ricard were in charge of the bombing file. No group took responsibility for the attack, but the GIA was suspected of being behind the attack. However, unlike this bombing, the group had claimed all the bombings in the campaign.

The Paris meridian is a meridian line running through the Paris Observatory in Paris, France – now longitude 2°20′14.02500″ East. It was a long-standing rival to the Greenwich meridian as the prime meridian of the world. The "Paris meridian arc" or "French meridian arc" (French: la Méridienne de France) is the name of the meridian arc measured along the Paris meridian.The French meridian arc was important for French cartography, inasmuch as the triangulations of France began with the measurement of the French meridian arc. Moreover, the French meridian arc was important for geodesy as it was one of the meridian arcs which were measured to determine the figure of the Earth via the arc measurement method. The determination of the figure of the Earth was a problem of the highest importance in astronomy, inasmuch as the diameter of the Earth was the unit to which all celestial distances had to be referred.

The Hôtel de Massa is an 18th-century hôtel particulier, or large townhouse, at 38 rue du Faubourg Saint-Jacques in the 14th arrondissement of Paris. It was originally located on the avenue des Champs-Élysées and was moved in 1929 to its present location, in a park beside the gardens of the Paris Observatory. Classified as a historical monument, it has since been occupied by the Société des gens de lettres.

The Hôpital Cochin is a hospital of public assistance in the rue du Faubourg-Saint-Jacques Paris 14e. It houses the central burn treatment centre of the city. The Hôpital Cochin is a section of the Faculté de Médecine Paris-Descartes. It commemorates Jean-Denis Cochin, curé of the parish of Saint-Jacques-du-Haut-Pas and founder of a hospital for the workers and poor of that quarter of Paris.Since 1990, a biomedical research centre, the Institut Cochin, has been associated with the hospital. It was reorganised in 2002 to embrace genetic research, molecular biology and cellular biology, with a staff of about 600. It is part of both INSERM and CNRS, integrated with the Université Paris V. In 2004 the Maison de Solenn, a shelter for adolescents, was opened within the hospital with the active support of Bernadette Chirac; its name commemorates Solenn Poivre d'Arvor.

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.

The Paris Observatory (French: Observatoire de Paris French pronunciation: ​[ɔbsɛʁvatwaʁ də paʁi]), a research institution of the Paris Sciences et Lettres University, is the foremost astronomical observatory of France, and one of the largest astronomical centers in the world. Its historic building is on the Left Bank of the Seine in central Paris, but most of the staff work on a satellite campus in Meudon, a suburb southwest of Paris. The Paris Observatory was founded in 1667. Construction was completed by the early 1670s and coincided with a major push for increased science, and the founding of the Royal Academy of Sciences. King Louis XIV's minister of finance organized a "scientific powerhouse" to increase understanding of astronomy, maritime navigation, and science in general.Through the centuries the Paris Observatory has continued in support of astronomical activities, and in the 21st century connects multiple sites and organizations, supporting astronomy and science, past and present.

The Fontaine de l'Observatoire is a monumental fountain located in the Jardin Marco Polo, south of the Jardin du Luxembourg in the 6th arrondissement of Paris, with sculpture by Jean-Baptiste Carpeaux. It was dedicated in 1874. It is also known as the Fontaine des Quatre-Parties-du-Monde, for the four parts of the world embodied by its female figures, or simply the Fontaine Carpeaux.

The quartier du Val-de-Grâce is the 19th administrative district or 'quartier' of Paris, located in the 5th arrondissement of the city. Its borders are boulevard de Port-Royal to the south, boulevard Saint-Michel to the west, rue Soufflot, rue des Fossés-Saint-Jacques and rue de l'Estrapade to the north and rue Mouffetard and rue Pascal to the east. It is named for the Val-de-Grâce military hospital and former abbey on boulevard de Port-Royal.

The Church of the Val-de-Grâce is a Roman Catholic church in the 5th arrondissement of Paris, in what is now the Val-de-Grâce Hospital. The edifice was formerly a royal abbey, and its dome is a principal landmark of the skyline of Paris. The church was initially designed by François Mansart, succeeded by Jacques Lemercier who designed the Saint-Sacrament chapel's spiral-coffered dome after Philibert de L'Orme's chapel at the Château d'Anet.

The Institut d'Art et d'Archéologie is a building at 3 rue Michelet in Paris, built for the educational institution of the same name (French for "Institute of Art and Archaeology") and completed in 1928. Its unique eclectic design, by architect Paul Bigot, was conceived as an alternative to both art deco and the International Style which were ascendant at the time. It has been dubbed "the most curious building in Paris". The building is currently occupied by the École d'Histoire de l’Art et d'Archéologie, a department of Paris 1 Panthéon-Sorbonne University.