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In 1676, the Danish astronomer Ole Roemer (1644–1710) became the first person to measure the speed of light. Roemer measured the speed of light by timing eclipses of Jupiter's moon Io. In this figure, S is the Sun, E1 is the Earth when closest to Jupiter (J1) and E2 is the Earth about six months later, on the opposite side of the Sun from ...
By timing the eclipses of Jupiter's moon Io, Rømer estimated that light would take about 22 minutes to travel a distance equal to the diameter of Earth's orbit around the Sun. Using modern orbits, this would imply a speed of light of 226,663 kilometres per second, 24.4% lower than the true value of 299,792 km/s.
1 de dic. de 2004 · Ole Rømer’s 1676 demonstration that light propagates at a finite speed must have been a revelation to the members of the French Royal Academy of Science. A young and brilliant Danish “postdoc” at the Paris Observatory, Rømer had unexpectedly answered a long-standing fundamental question.
20 de feb. de 2018 · Ole Rømer did not measure a change in the frequency of light. He measured an apparent change in the orbital period of Io, one of Jupiter's moons. The orbit of Io can be measured very accurately by observing when it enters or leaves the shadow of Jupiter.
7 de oct. de 2014 · The speed of light is a quantity that eluded some of the most renowned scholars in history, including Augustine and Galileo. In fact, at the time of Rømer’s successful prediction, there was ongoing debate over whether light had a measurable speed at all, or was somehow transmitted instantaneously.
1676: Ole Rømer Measures the Speed of Light. Light travels so amazingly fast that it was very difficult to measure its speed. The first person to succeed was Danish astronomer Ole Christensen Rømer. His accomplishment was an essential step in developing an understanding of the universe.
Ole Roemer, Danish astronomer who demonstrated conclusively that light travels at a finite speed. This was accomplished when he accurately predicted the eclipse of Io in November 1676. Roemer later served as Denmark’s royal mathematician. Learn more about his life and work.
