Wilheltn Foerster, a German astronomer, born at Grunberg, Silesia, Dec. 16, 1832. He studied in Berlin and in Bonn, where he graduated in 1854. He became second assistant at the Berlin observatory in 1855, first assistant in 18G0, professor in 1863, and director of the observatory in March, 1865. He is prominently connected with the most important astronomical periodicals, and secretary of the astronomical society, and since the close of 1868 has been at the head of the commission for establishing German weights and measures upon a metrical basis.