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Archimedes of Syracuse [a] (/ ˌ ɑːr k ɪ ˈ m iː d iː z / AR-kim-EE-deez; [2] c. 287 – c. 212 BC) was an Ancient Greek mathematician, physicist, engineer, astronomer, and inventor from the ancient city of Syracuse in Sicily. [3]
Archimedes is a genus of fenestrate bryozoans with a calcified skeleton of a delicate spiral-shaped mesh that was thickened near the axis into a massive corkscrew-shaped central structure. The most common remains are fragments of the mesh that are detached from the central structure, and these may not be identified other than by association ...
Archimedes before his death with a Roman soldier – copy of a Roman mosaic from the 2nd century. Marcus Claudius Marcellus had ordered that Archimedes, the well-known mathematician – and possibly equally well-known to Marcellus as the inventor of the mechanical devices that had so dominated the siege – should not be killed. Archimedes, who ...
Archimedes (c. 287 – c. 212 BC) gave an upper bound for the circumference of the Earth. In proposition 2 of the First Book of his treatise On Floating Bodies, Archimedes demonstrates that "The surface of any fluid at rest is the surface of a sphere whose centre is the same as that of the Earth."
Archimedes is purported to have invented a large scale solar furnace, sometimes described as a heat ray, and used it to burn attacking Roman ships during the Siege of Syracuse (c. 213–212 BC). It does not appear in the surviving works of Archimedes and there is no contemporary evidence for it, leading to modern scholars doubting its existence.
Eratosthenes made several important contributions to mathematics and science, and was a friend of Archimedes. Around 255 BC, he invented the armillary sphere. In On the Circular Motions of the Celestial Bodies, [11] Cleomedes credited him with having calculated the Earth's circumference around 240 BC, with high accuracy. [2]
The main hôtels particuliers have since been restored and turned into museums: the Hôtel Salé hosts the Picasso Museum, the Hôtel Carnavalet the Paris Historical Museum, the Hôtel Donon the Cognacq-Jay Museum, and the Hôtel de Saint-Aignan hosts the Musée d'Art et d'Histoire du Judaïsme.
The Palais-Royal (French: [pa.lɛ ʁwa.jal]) is a former French royal palace located on Rue Saint-Honoré in the 1st arrondissement of Paris.The screened entrance court faces the Place du Palais-Royal, opposite the Louvre.