1821 – Born on November 18th in Berlin. German astronomer.
1839 – He entered the University of Berlin, where he studied mathematics, astronomy and physics, as well as chemistry, philosophy and philology.
1843 – He received his Ph.D. from the University of Berlin.
– He took an active part in astronomical work at the Berlin observatory, under the direction of J. F. Encke, contributing numerous important papers on the orbits of comets and minor planets to the Astronomische Nachrichten.
1847 – He was appointed director of the Bilk observatory.
1848 – Published the well-known Memoire sur la comete elliptique de De Vico, for which he received the gold medal of the Amsterdam Academy.
1851 – Became a first assistant at the Berlin observatory.
1854 – Accepted the post of director of the new observatory at Ann Arbor, Michigan, U.S.A.
1857-1869 – He published Astronomical Notices, while his tables of the minor planets Flora, Victoria and Iris were severally issued.
– Became an associate director of the observatory, to Albany, New York.
– He accepted the post of Andrews professor of astronomy in the university of Dublin and astronomer-royal of Ireland.
1891 – Died on August 20th.