By Johan C.-E. Stén

ISBN-10: 3319006177

ISBN-13: 9783319006178

ISBN-10: 3319006185

ISBN-13: 9783319006185

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 was once at the beginning invited via Euler from his local city of Abo (Turku) in Finland to Saint Petersburg to help within the mathematical processing of the astronomical information of the drawing close transit of Venus of 1769. many years later he turned a normal member of the Academy. this can be the first-ever full-length biography dedicated to Lexell and his prolific clinical output. His wealthy correspondence in particular from his grand travel 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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**Extra info for A Comet of the Enlightenment: Anders Johan Lexell's Life and Discoveries**

**Example text**

Stling, Gestr. begärande ther til Facultetens tilstånd, hwilket Faculteten icke heller will wägra, enär bemälte Magister upter sitt Magister bref och genom Disputations ingifwande til censur hos Decanus wisar sin skickelighet. Och som Capitaine Meldercreutz, hwilkom, jämte Decano tilkommer pröfwa thetta hans profession tilhörande ämne, nu är borta med Illustrissimi Cancellarii tilstånd, i fall Wälbemälte Capitaine til början af Mars månad, tå permission uphörer, ej kommer i staden, på thet Magister Lexell icke må hindras i the angelägenheter han föregifwer, resolverade Faculteten, at låta Disputation til Profes.

Belonged to the 4th class. Scientists specialised in astronomical instruments and their perfection belonged to the 5th class, those specialised in naval applications to the 6th class. — Mathematical astronomers developing methods to derive astronomical formulae and tables belonged to the 7th class. The description of this class of astronomers seems to fit among others Edmond Halley, John Flamsteed, Tobias Mayer, Nicolas Louis de La Caille and Pehr Wilhelm Wargentin. The so-called working astronomers of the 8th class were those who rendered services to the mathematical and the learned astronomers.

2 Intellectual Awakening Exactly when and how Anders Johan’s mathematical talent first became noticeable, and who was his first teacher, is not known. 6 Lexell’s loss of his mother, at the age of nine, was certainly a severe blow, and it could well have been even more fatal for his development, had the family not been relatively well-off. As it was, Anders Johan could be enrolled in the town’s Gymnasium, from which he duly graduated in 1755, to enter the University, the Royal Academy of Åbo. By general European eighteenth-century standards the Royal Academy of Åbo was a small provincial university, admitting around 100 students annually, of which only a fraction left with a degree.

### A Comet of the Enlightenment: Anders Johan Lexell's Life and Discoveries by Johan C.-E. Stén

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