Anders Jonas Ångström (1814-74), Swedish astronomer and physicist. Ångström was born in Lögdö, Medelpad, and educated at the University of Uppsala. After graduating, he taught physics there from 1839 until his death. From 1867 he was secretary of the Royal Society of Sciences in Uppsala. Ångström was a pioneer in the study of spectra. This work led to his discovery, in 1862, of the existence of hydrogen in the atmosphere of the sun. A unit of measurement of wavelength, the angstrom, is named in his honor.
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