He directed the Mannheim observatory from 1813 to 1815 , and then in 1815 was appointed Professor of Astronomy in Copenhagen and Director of the Observatory .
From 1808 , he was adjunct professor of astronomy in Copenhagen .
professor directed the Mannheim observatory from 1813 to 1815 , and then in 1815 was appointed Professor of Astronomy in Copenhagen and Director of the Observatory .
From 1808 , he was adjunct professor of astronomy in Copenhagen .