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how did james bradley calculate the speed of light. The next substantial improvement in measuring the speed of light took place in 1728 in England. It is exact because by international agreement a metre is defined as the length of the path travelled by light in vacuum during a time interval of 1 299 792 458 second.
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The amount of telescope tilt required allowed Bradley to calculate the speed of light which he found to be 301000 kms. The mirror would reflect the beam back and would shine through the next gap between the teeth. If not instantaneous it is extremely rapid.
The next substantial improvement in measuring the speed of light took place in 1728 in England.
The measurements were getting better. The amount of telescope tilt required allowed Bradley to calculate the speed of light which he found to be 301000 kms. In his case 301000 kilometers per second. The Dutch scientist Christiaan Huygens who first did the arithmetic found a value for the speed of light equivalent to 131000 miles per second.
