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Anders Johan Lexell
Anders Johan Lexell (24 December 1740 – ) was a Finnish-Swedish astronomer, mathematician, and physicist who spent most of his life in Imperial Russia, where he was known as Andrei Ivanovich Leksel (Андрей Иванович Лексель). Lexell made important discoveries in polygonometry and celestial mechanics; the latter led to a comet named in his honour. La Grande Encyclopédie states that he was the prominent mathematician of his time who contributed to spherical trigonometry with new and interesting solutions, which he took as a basis for his research of comet and Planetary motion, planet motion. His name was given to a theorem of spherical triangles. Lexell was one of the most prolific members of the Russian Academy of Sciences at that time, having published 66 papers in 16 years of his work there. A statement attributed to Leonhard Euler expresses high approval of Lexell's works: "Besides Lexell, such a paper could only be written by D'Alambert or me". Dan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Friedrich Anthing
Johann Friedrich Anthing (1753–1805) was a German serviceman, artist and historian. Biography Johann Friedrich Anthing was born on 26 May 1753 in Gotha (then in the Saxe-Coburg Duchy, now in Thuringia). After his theological studies in Iena, Anthing travelled across Europe, going from one royal court to the next, as a silhouette artist. He drew portraits of princes, courtiers and famous personalities such as Goethe during his stay at the Weimar court (1789). He was employed in Saint-Petersburg from 1783 and drew portraits of members of the imperial family, including Grand Duke Paul Petrovitch (then Paul I of Russia) and his wife Maria Fedorovna, as well as members of the Saint Petersburg Academy of Sciences. Anthing travelled to Frankfurt in 1790 to attend the crowning of Leopold II, and he published a description of the ceremony. In 1793, Anthing returned to Russia and became Marshal Alexander Suvorov's Aide-de-camp. He would later write a three-volume biography of Suvor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |