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César-François Cassini De Thury
César-François Cassini de Thury (17 June 1714 – 4 September 1784), also called Cassini III or Cassini de Thury, was a French astronomer and cartographer. Biography Cassini de Thury was born in Thury-sous-Clermont, in the Oise department, the second son of Jacques Cassini and Suzanne Françoise Charpentier de Charmois. He was a grandson of Giovanni Domenico Cassini, and would become the father of Dominique, comte de Cassini, Jean-Dominique Cassini, Comte de Cassini. In 1739, he became a member of the French Academy of Sciences as a supernumerary adjunct astronomer, in 1741 as an adjunct astronomer, and in 1745 as a full member astronomer. In January, 1751 he was elected a Fellow of the Royal Society. He succeeded to his father's official position in 1756 and continued the hereditary surveying operations.Jonathan Powell, ''From Cave Art to Hubble: A History of Astronomical Record Keeping'', (Springer Nature Switzerland AG, 2019), 115 In 1744, he began the construction ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jean-Marc Nattier
Jean-Marc Nattier (17 March 1685 – 7 November 1766) was a French painter. He was born in Paris, the second son of Marc Nattier (1642–1705), a portrait painter, and of Marie Courtois (1655–1703), a miniaturist. He is noted for his portraits of the ladies of King Louis XV's court in classical mythological attire. Life He received his first instruction from his father, and from his uncle, the history painter Jean Jouvenet (1644–1717). He enrolled in the Royal Academy in 1703 and applied himself to copying pictures in the Luxembourg Palace, making a series of drawings of the Marie de Médici painting cycle by Peter Paul Rubens. The publication (1710) of engravings based on these drawings made Nattier famous, but he declined to proceed to the French Academy in Rome, though he had taken the first prize at the Paris Academy at the age of fifteen. In 1715 he went to Amsterdam, where Peter the Great was then staying, and painted portraits of the tsar and the empre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surveying
Surveying or land surveying is the technique, profession, art, and science of determining the terrestrial two-dimensional or three-dimensional positions of points and the distances and angles between them. A land surveying professional is called a land surveyor. These points are usually on the surface of the Earth, and they are often used to establish maps and boundaries for ownership, locations, such as the designed positions of structural components for construction or the surface location of subsurface features, or other purposes required by government or civil law, such as property sales. Surveyors work with elements of geodesy, geometry, trigonometry, regression analysis, physics, engineering, metrology, programming languages, and the law. They use equipment, such as total stations, robotic total stations, theodolites, GNSS receivers, retroreflectors, 3D scanners, LiDAR sensors, radios, inclinometer, handheld tablets, optical and digital levels, subsurface locators, d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientists From Paris
A scientist is a person who conducts scientific research to advance knowledge in an area of the natural sciences. In classical antiquity, there was no real ancient analog of a modern scientist. Instead, philosophers engaged in the philosophical study of nature called natural philosophy, a precursor of natural science. Though Thales (circa 624-545 BC) was arguably the first scientist for describing how cosmic events may be seen as natural, not necessarily caused by gods,Frank N. Magill''The Ancient World: Dictionary of World Biography'', Volume 1 Routledge, 2003 it was not until the 19th century that the term ''scientist'' came into regular use after it was coined by the theologian, philosopher, and historian of science William Whewell in 1833. In modern times, many scientists have advanced degrees in an area of science and pursue careers in various sectors of the economy such as academia, industry, government, and nonprofit environments.'''' History The roles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1784 Deaths
Events January–March * January 6 – Treaty of Constantinople: The Ottoman Empire agrees to Russia's annexation of the Crimea. * January 14 – The Congress of the United States ratifies the Treaty of Paris with Great Britain to end the American Revolution, with the signature of President of Congress Thomas Mifflin.''Harper's Encyclopaedia of United States History from 458 A. D. to 1909'', ed. by Benson John Lossing and, Woodrow Wilson (Harper & Brothers, 1910) p167 * January 15 – Henry Cavendish's paper to the Royal Society of London, ''Experiments on Air'', reveals the composition of water. * February 24 – The Captivity of Mangalorean Catholics at Seringapatam begins. * February 28 – John Wesley ordains ministers for the Methodist Church in the United States. * March 1 – The Confederation Congress accepts Virginia's cession of all rights to the Northwest Territory and to Kentucky. * March 22 – The Emerald Buddha is insta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1714 Births
Events January–March * January 21 – After being tricked into deserting a battle against India's Mughal Empire by the rebel Sayyid brothers, Prince Azz-ud-din Mirza is blinded on orders of the Emperor Farrukhsiyar as punishment. * February 7 – The Siege of Tönning (a fortress of the Swedish Empire and now located in Germany in the state of Schleswig-Holstein) ends after almost a year, as Danish forces force the surrender of the remaining 1,600 defenders. The fortress is then leveled by the Danes. * February 28 – (February 17 old style) Russia's Tsar Peter the Great issues a decree requiring compulsory education in mathematics for children of government officials and nobility, applying to children between the ages of 10 and 15 years old. * March 2 – (February 19 old style) The Battle of Storkyro is fought between troops of the Swedish Empire and the Russian Empire, near what is now the village of Napue in Finland. The outnumbered Swedish forces, under the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cassini Projection
The Cassini projection (also sometimes known as the Cassini–Soldner projection or Soldner projection) is a map projection described by César-François Cassini de Thury in 1745. It is the transverse aspect of the equirectangular projection, in that the globe is first rotated so the central meridian becomes the "equator", and then the normal equirectangular projection is applied. Considering the earth as a sphere, the projection is composed of the operations: :x = \arcsin(\cos \varphi \sin \lambda) \qquad y = \arctan\left(\frac\right). where ''λ'' is the longitude from the central meridian and ''φ'' is the latitude. When programming these equations, the inverse tangent function used is actually the atan2 function, with the first argument sin ''φ'' and the second . The reverse operation is composed of the operations: :\varphi = \arcsin(\sin y \cos x) \qquad \lambda = \operatorname(\tan x, \cos y). In practice, the projection has always been applied to models of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smallpox
Smallpox was an infectious disease caused by variola virus (often called smallpox virus) which belongs to the genus Orthopoxvirus. The last naturally occurring case was diagnosed in October 1977, and the World Health Organization (WHO) certified the global eradication of the disease in 1980, making it the only human disease to be eradicated. The initial symptoms of the disease included fever and vomiting. This was followed by formation of ulcers in the mouth and a skin rash. Over a number of days, the skin rash turned into the characteristic fluid-filled blisters with a dent in the center. The bumps then scabbed over and fell off, leaving scars. The disease was spread between people or via contaminated objects. Prevention was achieved mainly through the smallpox vaccine. Once the disease had developed, certain antiviral medication may have helped. The risk of death was about 30%, with higher rates among babies. Often, those who survived had extensive scarring of their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dunkirk-Collioure Arc Measurement (Cassini De Thury And De Lacaille)
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. History French cartography and the figure of the Earth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paris Meridian
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. History French cartography and the figure of the Earth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arc Measurement
Arc measurement, sometimes degree measurement (german: Gradmessung), is the astrogeodetic technique of determining of the radius of Earth – more specifically, the local Earth radius of curvature of the figure of the Earth – by relating the latitude difference (sometimes also the longitude difference) and the geographic distance (arc length) surveyed between two locations on Earth's surface. The most common variant involves only astronomical latitudes and the meridian arc length and is called ''meridian arc measurement''; other variants may involve only astronomical longitude (''parallel arc measurement'') or both geographic coordinates (''oblique arc measurement''). Arc measurement campaigns in Europe were the precursors to the International Association of Geodesy (IAG). History The first known arc measurement was performed by Eratosthenes (240 BC) between Alexandria and Syene in what is now Egypt, determining the radius of the Earth with remarkable correctness. In the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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