|
André-Louis Danjon
André-Louis Danjon (; 6 April 1890 – 21 April 1967) was a French astronomer who served as director of the Observatory of Strasbourg from 1930 to 1945 and of the Paris Observatory from 1945 to 1963. He developed several astronomical instruments to examine the regularity of the rotation of the earth and among his discoveries was an acceleration of the rotation of the Earth during periods of intense solar activity occurring in 11-year cycles correlated with an increase in earthquakes. The Danjon scale is used for measuring the intensity of lunar eclipses. He noted an increase in the number of dark lunar eclipses with solar activity which is termed as the Danjon effect. Life and work Danjon was born in Caen to drapers Louis Dominique Danjon and Marie Justine Binet. He studied at the Lyce Malherbe and then went to the Ecole Normale Superieure during which time he worked at the observatory of the Societe Astronomique de France. He graduated in 1914 and was conscripted into the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caen
Caen (; ; ) is a Communes of France, commune inland from the northwestern coast of France. It is the Prefectures in France, prefecture of the Departments of France, department of Calvados (department), Calvados. The city proper has 105,512 inhabitants (), while its Functional area (France), functional urban area has 470,000,Comparateur de territoire , INSEE, retrieved 20 June 2022. making Caen the second largest urban area in Normandy (administrative region), Normandy and the 19th largest in France. It is also the third largest commune in all of Normandy after Le Havre and Rouen. It is located northwest of Paris, connected to the South of England by the Caen (Ouistreham) to Portsmouth ferry route through the English Channel. Situated a few miles from the coast, the landing beaches, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lunar Phase
A lunar phase or Moon phase is the apparent shape of the Moon's directly sunlit portion as viewed from the Earth. Because the Moon is tidally locked with the Earth, the same hemisphere is always facing the Earth. In common usage, the four major phases are the new moon, the first quarter, the full moon and the last quarter; the four minor phases are waxing crescent, waxing gibbous, waning gibbous, and waning crescent. A lunar month is the time between successive recurrences of the same phase: due to the eccentricity of the Moon's orbit, this duration is not perfectly constant but averages about 29.5 days. The appearance of the Moon (its phase) gradually changes over a lunar month as the relative orbital positions of the Moon around Earth, and Earth around the Sun, shift. The visible side of the Moon is sunlit to varying extents, depending on the position of the Moon in its orbit, with the sunlit portion varying from 0% (at new moon) to nearly 100% (at full moon). Phenomenon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hauts-de-Seine
Hauts-de-Seine (; ) is a department in the Île-de-France region of France. It covers Paris's western inner suburbs. It is bordered by Paris, Seine-Saint-Denis and Val-de-Marne to the east, Val-d'Oise to the north, Yvelines to the west and Essonne to the south. With a population of 1,624,357 (as of 2019)Populations légales 2019: 92 Hauts-de-Seine INSEE and a total area of 176 square kilometres (68 square miles), it has the second highest among all departments of France, after Paris. It is the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prix Jules Janssen
The Prix Jules Janssen is the highest award of the Société astronomique de France (SAF), the French astronomical society. This annual prize is given to a professional French astronomer or to an astronomer of another nationality in recognition of astronomical work in general, or for services rendered to Astronomy. The first recipient of the prize was Camille Flammarion, the founder of the Société astronomique de France, in 1897. The prize has been continuously awarded since then with the exception of the two World Wars. Non-French recipients have come from various countries including the United States, the United Kingdom, Canada, Switzerland, the Netherlands, Germany, Belgium, Sweden, Italy, Spain, Hungary, India, the former Czechoslovakia, and the former Soviet Union. It was established by the French astronomer Pierre Jules César Janssen (known as Jules Janssen) during his tenure as president of SAF from 1895 to 1897. Janssen announced the creation of the new prize at a mee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L'Astronomie (magazine)
''LAstronomie'' () is a monthly astronomy magazine published by the Société astronomique de France (SAF). Sylvain Bouley, the president of SAF, is the publication director and astronomer Fabrice Mottez is the editor-in-chief An editor-in-chief (EIC), also known as lead editor or chief editor, is a publication's editorial leader who has final responsibility for its operations and policies. The editor-in-chief heads all departments of the organization and is held accoun .... History The magazine was established by Camille Flammarion and the first issue, dated 1882, was published on January 1, 1883. After SAF was founded in 1887, a second journal was created, called the ''Bulletin mensuel de la Société Astronomique de France''. The two publications existed in parallel up to 1894. In the December 1894 issue, Flammarion announced in an editorial that ''LAstronomie'' would cease to exist. From January 1895 to December 1910, only the ''Bulletin de la Société Astronomique de Fra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Société Astronomique De France
The Société astronomique de France (SAF; ), the France, French astronomical society, is a non-profit association in the public interest organized under French law (Association loi de 1901). Founded by astronomer Camille Flammarion in 1887, its purpose is to promote the development and practice of astronomy. History SAF was established by Camille Flammarion and a group of 11 persons on 28 January 1887 in Flammarion's apartment at 16 rue Cassini, 75014 Paris, close to the Paris Observatory. Open to all, SAF includes both professional and amateur astronomers as members, from France and abroad.Ferlet R. (2003) "The Société Astronomique de France in the Astronomical Landscape: Evolution and Prospects." In: ''Organizations and Strategies in Astronomy''. Astrophysics and Space Science Library, vol 296. Springer, Dordrecht. Its objective was defined at the time of its establishment as: "A Society is founded with the aim of bringing together people engaged practically or theoretica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crescent
A crescent shape (, ) is a symbol or emblem used to represent the lunar phase (as it appears in the northern hemisphere) in the first quarter (the "sickle moon"), or by extension a symbol representing the Moon itself. In Hindu iconography, Hindu Iconography, Shiva is often shown wearing a crescent moon on his head, symbolising his control over time, as well as his attributes of both creation and destruction. It is used as the astrological symbol for Moon (astrology), the Moon, and hence as the alchemical symbol for silver. It was also the emblem of Diana (mythology), Diana/Artemis, and hence represented virginity. In veneration of Mary in the Catholic Church, it is associated with Mary, mother of Jesus. From its use as roof finial in Ottoman architecture, Ottoman mosques, it has also become associated with Islam, and the crescent was introduced as Religious symbolism in the United States military#Muslim, chaplain badge for Muslim United States military chaplains in 1993.On Dece ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angular Separation
Angular distance or angular separation is the measure of the angle between the orientation of two straight lines, rays, or vectors in three-dimensional space, or the central angle subtended by the radii through two points on a sphere. When the rays are lines of sight from an observer to two points in space, it is known as the apparent distance or apparent separation. Angular distance appears in mathematics (in particular geometry and trigonometry) and all natural sciences (e.g., kinematics, astronomy, and geophysics). In the classical mechanics of rotating objects, it appears alongside angular velocity, angular acceleration, angular momentum, moment of inertia and torque. Use The term ''angular distance'' (or ''separation'') is technically synonymous with ''angle'' itself, but is meant to suggest the linear distance between objects (for instance, a pair of stars observed from Earth). Measurement Since the angular distance (or separation) is conceptually identical to an ang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Danjon Prismatic Astrolabe (1954), Quito Astronomical Observatory
Danjon may refer to: * André-Louis Danjon André-Louis Danjon (; 6 April 1890 – 21 April 1967) was a French astronomer who served as director of the Observatory of Strasbourg from 1930 to 1945 and of the Paris Observatory from 1945 to 1963. He developed several astronomical instrume ... (1890–1967), French astronomer * Danjon scale, used for measuring lunar eclipse brightness * Danjon (crater), a lunar crater {{Disambiguation, surname ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Astronomical Society
The Royal Astronomical Society (RAS) is a learned society and charitable organisation, charity that encourages and promotes the study of astronomy, planetary science, solar-system science, geophysics and closely related branches of science. Its headquarters are in Burlington House, on Piccadilly in London. The society has over 4,000 members, known as fellows, most of whom are professional researchers or postgraduate students. Around a quarter of Fellows live outside the UK. The society holds monthly scientific meetings in London, and the annual National Astronomy Meeting at varying locations in the British Isles. The RAS publishes the scientific journals ''Monthly Notices of the Royal Astronomical Society'', ''Geophysical Journal International'' and ''RAS Techniques and Instruments'', along with the trade magazine ''Astronomy & Geophysics''. The RAS maintains an astronomy research library, engages in public outreach and advises the UK government on astronomy education. The socie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George Darwin
Sir George Howard Darwin (9 July 1845 – 7 December 1912) was an English barrister and astronomer, the second son and fifth child of Charles Darwin and Emma Darwin. He is known for the harmonic analysis of the theory of tides. The Darwin symbols for tides are named after him. Biography George H. Darwin was born 9 July 1845 at Down House, Kent, the fifth child of biologist Charles Darwin and Emma Darwin. From the age of 11 he studied under Charles Pritchard at Clapham Grammar School, and entered St John's College, Cambridge, in 1863, though he soon moved to Trinity College, where his tutor was Edward John Routh. He graduated BA in mathematics in 1868 (as second wrangler), when he was also placed second for the Smith's Prize and was appointed to a college fellowship. He became M.A. in 1871. He was admitted to the bar in 1872, but returned to science. George Darwin conducted studies into the prevalence and health outcomes of contemporary first-cousin marriages (such as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
François Auguste Claude
François Auguste Claude (30 December 1858 – 15 July 1938) was a French astronomer who worked at the Bureau des Longitudes which dealt with the measurement of longitude and the maintenance of standard time. He designed the first prismatic astrolabe An astrolabe (; ; ) is an astronomy, astronomical list of astronomical instruments, instrument dating to ancient times. It serves as a star chart and Model#Physical model, physical model of the visible celestial sphere, half-dome of the sky. It ... in 1899. Claude was born in Strasbourg and following the annexation of the Alsace region by Germany in 1871 he chose French citizenship and served in the army. He then worked as a designer for six years and joined the Bureau des Longitudes at the Parc de Montsouris in Paris. Despite having no formal university degrees, he became assistant calculator in 1884 and rose to the position of director in 1929. His most important contribution was the design of a (60°) prismatic astrolabe which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
