Nils Christofer Dunér

Nils Christofer Dunér (born May 21, 1839, Billeberga, Sweden—died Nov. 10, 1914, Stockholm) was a Swedish astronomer who studied the rotational period of the Sun. Dunér was senior astronomer (1864–88) at the Royal University Observatory in Lund, Sweden. In 1867 he began his investigations of binary stars. He also performed pioneering stellar spectroscopy studies (studies of the individual characteristic wavelengths of light). Shortly after he became professor of astronomy at the University of Uppsala and...