How was the speed of light measured first?

Considering the fact that the speed of light is the fastest known, how the scientist succeed it first time to measure it

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Blue_star
Watch neal degrass tyson:cosmos
(On netflix)
Its relaxing for when your stressed and or had a stressful day or when you cant fall asleep
on June 24
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Ravenclaw3243
Moving through a vacuum? Or other?
on July 18, 2014
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DiamondTheHedgehog
on July 17, 2014
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xxredfeatherx
umm idk but i can tell you that light years are measured in distance not time
on July 17, 2014
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