In science the speed of light is called the speed of travel of the rays in the air space or vacuum. Light is electromagnetic radiation that the human eye can apprehend. It is able to move in any environment that has a direct impact on its speed.
Attempts to measure this have been made since ancient times. Scientists of ancient times believed that the speed of light is infinite. The same opinion was expressed by the physics of the XVI–XVII centuries, although even then some researchers, such as Robert Hooke and Galileo Gallilei, allowed the limb of the sun's rays.
A major breakthrough in the study of the speed of light was due to the Danish astronomer Olaf römer to the who first drew attention to the delay of Eclipse of Jupiter's moon IO as compared to the initial calculations.
Then the scientist determine the approximate value of speed equal to 220 thousand meters per second. More precisely, this value was able to calculate the British astronomer James Bradley, and although he had slightly miscalculated.
In a further attempt to calculate the real speed of light was undertaken by scientists from different countries. However, only in the early 1970-ies with the advent of lasers and masers, which had a stable frequency radiation, the researchers were able to make an accurate calculation, and in 1983 was accepted modern value for correlation of relative error.