Abraham Gotthelf Kästner

Abraham Gotthelf Kästner
Abraham Gotthelf Kästner
Born	(1719-09-27)27 September 1719 Leipzig, Electorate of Saxony
Died	20 June 1800(1800-06-20) (aged 80) Göttingen, Duchy of Brunswick-Lüneburg
Residence	Germany
Nationality	German
Fields	Mathematics
Institutions	University of Leipzig University of Göttingen
Alma mater	University of Leipzig
Doctoral advisor	Christian August Hausen
Doctoral students	Johann Friedrich Pfaff Georg Christoph Lichtenberg Johann Tobias Mayer Heinrich Wilhelm Brandes Johann Christian Polycarp Erxleben
Other notable students	Farkas Bolyai Johann Christian Martin Bartels
Known for	Textbook writing

Abraham Gotthelf Kästner (27 September 1719 – 20 June 1800) was a German mathematician and epigrammatist.

He was known in his professional life for writing textbooks and compiling encyclopedias rather than for original research. Georg Christoph Lichtenberg was one of his doctoral students, and admired the man greatly. He became most well known for his epigrammatic poems. The crater Kästner on the Moon is named after him.

Kästner was the son of law professor Abraham Kästner. He married Anna Rosina Baumann in 1757 after a 12-year engagement. She died on 4 March 1758, less than a year later, of a lung disease. Later Kästner had a daughter Catharine with his cleaning lady.

Kästner studied law, philosophy, physics, mathematics and metaphysics in Leipzig from 1731, and was appointed a Notary in 1733. He gained his Habilitation from the University of Leipzig in 1739, and lectured there in mathematics, philosophy, logic and law, becoming an associate professor in 1746. In 1751 he was elected a member of the Royal Swedish Academy of Sciences. In 1756 he took up a position as full professor of natural philosophy and geometry at the University of Göttingen. In 1763, succeeding Tobias Mayer, he became director of the observatory as well. One of his doctoral students was the physicist and aphorist Georg Christoph Lichtenberg, who became a colleague of his at Göttingen. Other notable doctoral students were Johann Christian Polycarp Erxleben, Johann Pfaff (doctoral adviser of Carl Friedrich Gauss), Johann Tobias Mayer, Heinrich Wilhelm Brandes, Farkas Bolyai (father of János Bolyai), and Georg Klügel. Kästner died in 1800 in Göttingen.