ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Measuring the speed of light. Engraving showing the apparatus used by the French physicist Hippolyte Fizeau (1819-1896) to measure the speed of light. Artwork from Astronomie Populaire (Popular Astronomy) by Francois Arago (1786-1853), which was published posthumously in 1858.
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