The Danish <a href="https://en.wikipedia.org/wiki/Astronomer" id="mwNw" rel="mw:WikiLink" title="Astronomer">astronomer</a> <a href="https://en.wikipedia.org/wiki/Ole_Rømer" id="mwOA" rel="mw:WikiLink" title="Ole Rømer">Ole Rømer</a> <a href="https://en.wikipedia.org/wiki/Rømer's_determination_of_the_speed_of_light" id="mwOQ" rel="mw:WikiLink" title="Rømer's determination of the speed of light">presents</a> the first quantitative <a href="https://en.wikipedia.org/wiki/Measurement" id="mwOg" rel="mw:WikiLink" title="Measurement">measurements</a> of the <a href="https://en.wikipedia.org/wiki/Speed_of_light" id="mwOw" rel="mw:WikiLink" title="Speed of light">speed of light</a>.