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Yvon Villarceau
Antoine-Joseph Yvon Villarceau (15 January 1813 – 23 December 1883) was a French astronomer, mathematician, and engineer. He constructed an equatorial meridian-instrument and an isochronometric regulator for the Paris Observatory. He wrote ''Mécanique Céleste. Expose des Méthodes de Wronski et Composantes des Forces Perturbatrices suivant les Axes Mobiles'' (Paris: Gauthier-Villars, 1881) and ''Sur l'établissement des arches de pont, envisagé au point de vue de la plus grande stabilité'' (Paris: Imprimerie Impériale, 1853). He is the eponym of Villarceau circles, which are two circular sections of a torus other than the two trivial ones. A short street in the 16th arrondissement of Paris The 16th arrondissement of Paris (; ) is the westernmost of the 20 arrondissements of Paris, the capital city of France. Located on the city's Right Bank, it is adjacent to the 17th and 8th arrondissements to the northeast, as well as to the ... is named after Villarceau. B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eugène Pirou
Louis Eugène Pirou (26 September 1841 – 30 September 1909) was a French photographer and filmmaker, known primarily for his portraits of celebrities and scenes from the Paris Commune. He was awarded a gold medal at the Exposition Universelle of 1889. Life and work He owned numerous studios in Paris, mostly on the Boulevard Saint-Germain, but he also operated one at an old evangelical mission on the Rue Royale. That one was sold to a photographer named Arthur Herbert, in 1889, with permission to use Pirou's name. In 1898, Herbert sold the studio to the brothers Georges and Oscar Mascré (1865-1943), who continued to use Pirou's name without his permission. Pirou lost a complicated lawsuit against the brothers, who compounded the fraud by referring to the studio as "Otto-Pirou", in reference to Otto Wegener, a Swedish-born photographer who was also not associated with them.Camille Blot-Wellens, "Eugène Pirou, portraitiste de la Belle Époque", in ''Revue de la Bibliothèq ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astronomy
Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics, physics, and chemistry in order to explain their origin and their overall evolution. Objects of interest include planets, natural satellite, moons, stars, nebulae, galaxy, galaxies, meteoroids, asteroids, and comets. Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. More generally, astronomy studies everything that originates beyond atmosphere of Earth, Earth's atmosphere. Cosmology is a branch of astronomy that studies the universe as a whole. Astronomy is one of the oldest natural sciences. The early civilizations in recorded history made methodical observations of the night sky. These include the Egyptian astronomy, Egyptians, Babylonian astronomy, Babylonians, Greek astronomy, Greeks, Indian astronomy, Indians, Chinese astronomy, Chinese, Maya civilization, M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paris Observatory
The Paris Observatory (, ), a research institution of the Paris Sciences et Lettres University, is the foremost astronomical observatory of France, and one of the largest astronomical centres 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. Constitution Administratively, it is a '' grand étab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
École Centrale Paris
École or Ecole may refer to: * an elementary school in the French educational stages normally followed by Secondary education in France, secondary education establishments (collège and lycée) * École (river), a tributary of the Seine flowing in région Île-de-France * École, Savoie, a French commune * École-Valentin, a French commune in the Doubs département * Grandes écoles, higher education establishments in France * The École, a French-American bilingual school in New York City * Ecole Software, a Japanese video-games developer/publisher {{disambiguation, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astronomer
An astronomer is a scientist in the field of astronomy who focuses on a specific question or field outside the scope of Earth. Astronomers observe astronomical objects, such as stars, planets, natural satellite, moons, comets and galaxy, galaxies – in either observational astronomy, observational (by analyzing the data) or theoretical astronomy. Examples of topics or fields astronomers study include planetary science, Sun, solar astronomy, the Star formation, origin or stellar evolution, evolution of stars, or the galaxy formation and evolution, formation of galaxies. A related but distinct subject is physical cosmology, which studies the Universe as a whole. Types Astronomers typically fall under either of two main types: observational astronomy, observational and theoretical astronomy, theoretical. Observational astronomers make direct observations of Astronomical object, celestial objects and analyze the data. In contrast, theoretical astronomers create and investigate Con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meridian (astronomy)
In astronomy, the meridian is the great circle passing through the celestial poles, as well as the zenith and nadir of an observer's location. Consequently, it contains also the north and south points on the horizon, and it is perpendicular to the celestial equator and horizon. Meridians, celestial and geographical, are determined by the pencil of planes passing through the Earth's rotation axis. For a location ''not'' on this axis, there is a unique meridian plane in this axial-pencil through that location. The intersection of this plane with Earth's surface defines two '' geographical meridians'' (either one east and one west of the prime meridian, or else the prime meridian itself and its anti-meridian), and the intersection of the plane with the celestial sphere is the celestial meridian for that location and time. There are several ways to divide the meridian into semicircles. In one approach, the observer's upper meridian extends from a celestial pole and passes t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Villarceau Circles
In geometry, Villarceau circles () are a pair of circles produced by cutting a torus obliquely through its center at a special angle. Given an arbitrary point on a torus, four circles can be drawn through it. One is in a plane parallel to the equatorial plane of the torus and another perpendicular to that plane (these are analogous to lines of latitude and longitude on the Earth). The other two are Villarceau circles. They are obtained as the intersection of the torus with a plane that passes through the center of the torus and touches it tangentially at two antipodal points. If one considers all these planes, one obtains two families of circles on the torus. Each of these families consists of disjoint circles that cover each point of the torus exactly once and thus forms a 1-dimensional foliation of the torus. The Villarceau circles are named after the French astronomer and mathematician Yvon Villarceau (1813–1883) who wrote about them in 1848. Example Consider a horizontal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Torus
In geometry, a torus (: tori or toruses) is a surface of revolution generated by revolving a circle in three-dimensional space one full revolution about an axis that is coplanarity, coplanar with the circle. The main types of toruses include ring toruses, horn toruses, and spindle toruses. A ring torus is sometimes colloquially referred to as a donut or doughnut. If the axis of revolution does not touch the circle, the surface has a ring shape and is called a torus of revolution, also known as a ring torus. If the axis of revolution is tangent to the circle, the surface is a horn torus. If the axis of revolution passes twice through the circle, the surface is a Lemon (geometry), spindle torus (or ''self-crossing torus'' or ''self-intersecting torus''). If the axis of revolution passes through the center of the circle, the surface is a degenerate torus, a double-covered sphere. If the revolved curve is not a circle, the surface is called a ''toroid'', as in a square toroid. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
16th Arrondissement Of Paris
The 16th arrondissement of Paris (; ) is the westernmost of the 20 arrondissements of Paris, the capital city of France. Located on the city's Right Bank, it is adjacent to the 17th and 8th arrondissements to the northeast, as well as to the suburb of Boulogne-Billancourt, Hauts-de-Seine to the southwest. Across the Seine are the 7th and 15th arrondissements. Notable sights of the 16th arrondissement include the (at the junction with the 8th and 17th arrondissements) and the , where the stands. This complex is used for three museums and one theatre. Other museums and cultural venues are also located in this arrondissement, including the Louis Vuitton Foundation opened in 2014. With its ornate 19th-century buildings, large avenues, prestigious schools, museums, and various parks, the 16th arrondissement has long been known as one of French high society's favourite places of residence (comparable to London's Kensington and Chelsea or Berlin's Charlottenburg) to such an e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
P1170673 Paris XVI Rue Yvon-Villarceau Rwk
P117 may refer to: * , a patrol boat of the Mexican Navy * C19orf70, chromosome 19 open reading frame 70, a protein * Papyrus 117 Papyrus 117 (in the Gregory-Aland numbering), designated by siglum 𝔓117, is a copy of a small part of the New Testament in Greek. It is a papyrus manuscript of the Second Epistle to the Corinthians. The surviving texts of 2 Corinthians are ver ..., a biblical manuscript * P117, a state regional road in Latvia {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
19th-century French Astronomers
The 19th century began on 1 January 1801 (represented by the Roman numerals MDCCCI), and ended on 31 December 1900 (MCM). It was the 9th century of the 2nd millennium. It was characterized by vast social upheaval. Slavery was abolished in much of Europe and the Americas. The First Industrial Revolution, though it began in the late 18th century, expanded beyond its British homeland for the first time during the 19th century, particularly remaking the economies and societies of the Low Countries, France, the Rhineland, Northern Italy, and the Northeastern United States. A few decades later, the Second Industrial Revolution led to ever more massive urbanization and much higher levels of productivity, profit, and prosperity, a pattern that continued into the 20th century. The Catholic Church, in response to the growing influence and power of modernism, secularism and materialism, formed the First Vatican Council in the late 19th century to deal with such problems and confir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
