フリードリヒ・ヴィルヘルム・ベッセル
Carl Theodor Anger (Danzig, 31 July 1803 – Danzig, 25 March 1858) was a German mathematician and astronomer. He was a student of and assistant to Friedrich Bessel at the Königsberg Observatory from 1827 until 1831. Thereafter, he was appointed as astronomer by the Naturforschende Gesellschaft in Danzig.