What nationality was the man who determined that light has a finite speed?
Rømer's determination of the speed of light Rømer's determination of the speed of light was the demonstration in 1676 that light has a finite speed, and so does not travel instantaneously. The discovery is usually attributed to Danish astronomer Ole Rømer (1644–1710), who was working at the Royal Observatory in Paris at the time.
Gustav Herglotz Gustav Herglotz (2 February 1881 – 22 March 1953) was a German Bohemian mathematician. He is best known for his works on the theory of relativity and seismology.