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how to practically measure speed of light. Thanks to Gonelli for the sharp attention Of course any educated deer knows that light moves at approximately 30108 meters per second which is very fast. The two-way speed of light is the average speed of light from one point such as a source to a mirror and back again.
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The value of 299792458 meters per second 186282 miles per second is the speed of light in a vacuum. Any electromagnetic radiation radio waves infrared radiation ultraviolet radiation light radiation propagates in vacuum at the speed of light c. For instance when it moves through glass it slows down to about two-thirds of its speed in a vacuum.
Another way to measure the speed of light is to independently measure the frequency f and wavelength l of an electromagnetic wave in vacuum.
When the Earth is farther away it takes light from Io longer to get to Earth resulting in a longer apparent orbital period of Io. My best friend Bucs Gronkowski weighs return in 2021. The National Bureau of Standards in Boulder Colorado used helium-neon lasers and meticulously accurate cesium clocks to measure the speed of light. To Einstein no one should ever measure a speed of light that is moving at 15 times the speed of light or at any other speed other than exactly the speed of light.
