It was measured in 1887.
Hz (hertz) is a unit of frequency, not of speed.
The speed of light is a number. It was a theory before it was measured. After it was measured, and the prediction was found to be correct, it was no longer a theory nor a hypothesis. It became a "physical constant".
Are you asking when the speed of light was first estimated, or are you asking when the speed of light was first actually measured?
The speed of light cannot be measured IN A WAY. However it travels at 1,079,252,848.8 miles per hour or 299,792,458 meters per second. It cannot be measured however the numbers I showed is one way. Light cannot have a specified measurement, unless the light source is big or small etc...
A. A. Michelson was not interested in measuring the speed of light.He only measured how it changes if you move toward the light, awayfrom it, or sideways. (It doesn't.)
In light speed.
1
They are equal.
how far u can travel at the speed of light in a year
it was faucault who first measured the speed of light in water ......
It's never been measured, but it is assumed to be the same as the speed of light.
there is none.
Hz (hertz) is a unit of frequency, not of speed.
~33 Ohm
The speed of light is a number. It was a theory before it was measured. After it was measured, and the prediction was found to be correct, it was no longer a theory nor a hypothesis. It became a "physical constant".
James Clerk-Maxwell did. He was shown to be correct when the speed was actually measured.
It's never been measured, but it is assumed to be the same as the speed of light.