Image: Illustration from 1676 article on Ole Rømer's measurement of the speed of light

Description: A diagram of Jupiter (B) eclipsing its moon Io (DC) as viewed from different points in earth's orbit around the sun. From Olaf (Ole) Roemer, "Demonstration tovchant le mouvement de la lumiere trouvé par M. Römer de l' Academie Royale des Sciences," December 7, 1676. Translated into English as "A Demonstration Concerning the Motion of Light," Philosophical Transactions of the Royal Society 12 (June 25, 1677): 893-94. Scans of both the French and English versions of the paper are on the Web at http://dbhs.wvusd.k12.ca.us/webdocs/Chem-History/Roemer-1677/Roemer-1677.html. This image was scanned from a copy of Roemer's paper in William Francis Magie, A Source Book in Physics, 1st ed (New York, London: McGraw-Hill, 1935).
Title: Illustration from 1676 article on Ole Rømer's measurement of the speed of light
Credit: Olaf (Ole) Roemer, "Demonstration tovchant le mouvement de la lumiere trouvé par M. Römer de l' Academie Royale des Sciences," December 7, 1676.
Author: Ole Rømer
Usage Terms: Public domain
License: Public domain
Attribution Required?: No