Struve, Otto Wilhelm (1819–1905)
Otto Wilhelm Struve was a Russian-born German astronomer, son of Friedrich G. W. Struve, who accurately determined the rate of change of precession and estimated the velocity of Sun from the proper motions of nearby stars. He worked at Pulkovo Observatory, where he collaborated with his father in the search for double stars, and served as director from 1862 to 1899.
His grandson, also called Otto (go here) was director (1932–47) of the Yerkes Observatory and professor of astrophysics at the University of California (1950–59). He made important discoveries in the fields of stellar evolution and radial velocities.