I don't believe there was any serious attempt to measure the speed of light before
Galileo. That was a couple of millennia after the golden age of the Greek philosopher
'scientists', who, I believe, assumed the transfer of light to be instantaneous, and the
perception of distant events to be simultaneous with the event.
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The Greeks did not have the tools to measure the speed of light. The first successful measurement was done by Ole Roemer in 1676 using the timing of the eclipses of Jupiter's moons.
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The first successful attempt to measure the speed of light was in 1676 by Danish astronomer Ole Rømer. He estimated the speed of light by observing the eclipses of Jupiter's moon Io.
Galileo attempted to measure the speed of light using lanterns positioned at known distances and observing the time it took for light to travel between them. He would uncover the lanterns simultaneously and use a telescope to try and detect any delay in the light reaching his eyes. However, his methods were not sensitive enough to accurately measure the speed of light.
speed of light is constant velocity and does not accelerate so there is no g force
If you want to measure the speed of something, you first have to recall that speed is (distance traveled) divided by (time to travel the distance), and then you realize that you have to measure the distance it travels and the time it takes to travel that distance. If it happens to be the speed of light, then you immediately have a serious problem. The speed of light is so great that ... -- If you pick a distance that's easy to measure, then the time is impossibly short. For example, if you pick ten miles, then you have to accurately measure 0.00005368 of one second, which is pretty tough. -- If you pick a time that's easy to measure, then the distance is ridiculously long. For example, if you pick 0.1 second, then you have to accurately measure 18,628.2 miles, which is enormously tough. Both of these methods are theoretically and technically perfect, and completely impossible to actually use for the speed of light. You have to invent whole new clever ways to measure speed.