Background
Johann Georg Hagen was born in Bregenz, Austria. He was the son of a school teacher.
Astronomer university professor
Johann Georg Hagen was born in Bregenz, Austria. He was the son of a school teacher.
University of Bonn.
He volunteered for the ambulance service in the Franco-Prussian War, but was struck with typhoid fever. On July 4, 1872, Otto von Bismarck, chancellor of Germany, expelled the Jesuits from the German Empire. Johann left for England where he was eventually ordained into the priesthood.
In June 1880, he left England for the United States.
There he began teaching at Sacred Heart College in Prairie du Chien, Wisconsin. There he cultivated his interest in astronomy and built a small observatory for making astronomical observations.
In Wisconsin, he became a naturalized citizen. He was called to serve as the Director of the Georgetown University Observatory in 1888.
There he continued his research and published numerous articles and texts.
In mathematics, the Rothe–Hagen identity is named after him. lieutenant appears in his three-volume 1891 publication, Synopsis of Higher Mathematics. In 1906, John was called by Pope Pius X to take charge of the in Rome.
He died in Rome in The crater Hagen on the Moon is named after him.
German Academy of Sciences Leopoldina.