Ján Andrej Segner (Segner János András, 9 October 1704, Pozsony (Bratislava), Kingdom of Hungary - 5 October 1777, Halle) was a Hungarian mathematician, phisicist, doctor. Inventor of the Segner-wheel. Professor of the universities of Jena, Göttingen and Halle. The first Hungarian mathematician received internationally. October 9 is the 282nd day of the year (283rd in Leap years). ... Events Building of the Students Monument in Aiud, Romania. ... Bratislava is the capital of Slovakia and the countrys largest city, with a population of some 430,000. ... The Kingdom of Hungary is the name of a multiethnic kingdom that existed in Central Europe from 1000 to 1918. ... October 5 is the 278th day of the year (279th in Leap years). ... 1777 was a common year starting on Wednesday (see link for calendar). ...

His family, who had a German origin, settled down in the Kingdom of Hungary in the 15th Century and later they became Hungarian patricians. He studied at Pozsony (Bratislava), Győr, Debrecen. He went to the university of Jena in 1725. In 1729 he got a medical certificate and he came back to the Kingdom of Hungary. He worked as doctor in Debrecen but in 1732 he went back to Jena. He was the professor of the university in Jena, later - for 20 years - in Göttingen and finally in Halle. He established an observatory in Halle. The Kingdom of Hungary is the name of a multiethnic kingdom that existed in Central Europe from 1000 to 1918. ... (14th century - 15th century - 16th century - other centuries) As a means of recording the passage of time, the 15th century was that century which lasted from 1401 to 1500. ... Bratislava is the capital of Slovakia and the countrys largest city, with a population of some 430,000. ... Events February 8 - Catherine I became empress of Russia February 20 - The first reported case of white men scalping Native Americans takes place in New Hampshire colony. ... Events July 30 - Baltimore, Maryland is founded. ... The Kingdom of Hungary is the name of a multiethnic kingdom that existed in Central Europe from 1000 to 1918. ... Events February 23 - First performance of Handels Orlando, in London June 9 - James Oglethorpe is granted a royal charter for the colony of Georgia. ...

He was one of the best-known scientists of his age. Four prestigious academies (Berlin, Göttingen, London, Saint-Petersburg) selected him among their members.

He was the first mathematician who demonstrated the sign convention of Descartes.