By Johan C.-E. Stén
The Finnish mathematician and astronomer Anders Johan Lexell (1740–1784) used to be a long-time shut collaborator in addition to the educational successor of Leonhard Euler on the Imperial Academy of Sciences in Saint Petersburg. Lexell used to be at the start invited by means of Euler from his local city of Abo (Turku) in Finland to Saint Petersburg to help within the mathematical processing of the astronomical info of the drawing close transit of Venus of 1769. many years later he grew to become a standard member of the Academy. this is often the first-ever full-length biography dedicated to Lexell and his prolific medical output. His wealthy correspondence specially from his grand journey to Germany, France and England unearths him as a lucid observer of the highbrow panorama of enlightened Europe. within the skies, a comet, a minor planet and a crater at the Moon named after Lexell additionally perpetuate his memory.
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Additional resources for A Comet of the Enlightenment: Anders Johan Lexell's Life and Discoveries
The next year, however, Schultz’s young and ambitious stepson Jonas Lexell managed to establish himself as a goldsmith and eventually to become a respected and well-liked member of his professional community in Åbo. 4 He was also engaged in local administration and politics and served three times as the town’s parliamentary representative at the Diets (Riksdag) in Stockholm. Jonas Lexell was the leader of the Guild of Goldsmiths in Åbo and indisputably its most influential member during the whole eighteenth century (Fig.
Quadrants fixed to a wall, could also serve as passage instruments (the sextant is a better known portable version of the instrument). Telescopes used for the closer study of the celestial objects were of two kinds (and many varieties): refractors, where the light from a star is collected by a lens, and reflectors, where the light is collected by a concave mirror. At the beginning of the eighteenth century, refractor telescopes suffered from achromatic error, that is, the blurring of the image due to the differing refractive indices for light of different colours.
Among their five children seen in the picture, Dorothea Schlözer (1770– 1825), the lady with the globe to the left, was one of the first women to earn a doctorate in Germany (Universitätsbibliothek Göttingen. Schlözer-Stiftung Bilder AL 128. Published with permission) probably had never met, was the fact that he maintained close contacts with Swedish historians and scientists, especially Wargentin, and that he, as a member of the Petersburg Academy of Sciences, was aware of its need for competent scientists (a number of letters from Schlözer to Wargentin are preserved at KVAC, Stockholm).