= Anders Jonas Ångström
{c}
{tag=Physicist}
{title2=1814–1874}
{wiki}
= Anders Ångström
{c}
{synonym}
= A. J. Ångström
{c}
{synonym}
<Anders Jonas Ångström> developed quantitative optical <spectroscopy>, including precise measurements of the solar <spectrum>. His 1868 study measured the <wavelengths> of <Fraunhofer lines>, turning reproducible spectral landmarks into numerical standards. The <ångström>, $10^{-10}$ <metres>, bears his name. Such calibrated <wavelength> measurements let observations made with different instruments be compared, helping move <spectroscopy> from descriptions of colour to tests of material composition and physical models.<Anders Ångström by Uppsala University>[1853 optical investigations, 1868 solar-spectrum measurements and the wavelength unit]{ref}
A <physicist> appointed professor at Uppsala in 1858, whose research included <spectroscopy>.<Anders Ångström by Uppsala University>[Anders Ångström: optical spectroscopy research and appointment as professor of physics in 1858]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Anders_Jonas_%C3%85ngstr%C3%B6m_x_Hulda_Schenson.jpg?width=260]
{title=Portrait of <Anders Jonas Ångström>}
{description=Hulda Schenson; Vetenskapsakademiens porträttsamling. Public domain (PD-Art / Public Domain Mark 1.0, as stated on Commons). https://creativecommons.org/publicdomain/mark/1.0/[Source usage terms], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Anders_Jonas_%C3%85ngstr%C3%B6m_x_Hulda_Schenson.jpg}
{width=260}
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