The conversation between human and AI assistant.
How can I calculate the speed of light?
How was the speed of light first measured?
The speed of light was first measured in 1676 by Danish astronomer Ole Rømer using observations of the moons of Jupiter. He noticed that the time between eclipses of the moons varied depending on the position of the Earth in its orbit, which he attributed to the varying time needed for light to travel the extra distance when the Earth was farther from Jupiter.