After receiving his doctorate from Yale, Hall returned to the Naval Observatory as assistant astronomer.

Returning in 1869, he was appointed assistant astronomer at Altona in 1873, and afterwards at Kiel.

Among the fortunate savants who had been selected, was John Gaillard, assistant astronomer at the Mt. Wilson observatory.

In 1882 he became assistant astronomer for the United States Transit of Venus Commission.

He served as assistant astronomer from 1756 to 1760 under the Reverend James Bradley, the Astronomer Royal.

Brisbane was very interested in astronomy and brought two assistant astronomers to Australia with him.

Fatou was promoted to assistant astronomer in 1904 and to astronomer (astronom titulaire) in 1928.

When her husband died, Winkelmann applied for a position as assistant astronomer at Berlin Academy, for which she was highly qualified.

From 2001-2004 she was an assistant astronomer at the Lowell Observatory.

For some years he was assistant astronomer in the Argentine National Observatory in Cordoba.