Science Magazine

How The Speed Of Light Was First Measured

Posted on the 16 August 2013 by Gerard @presurfer
How The Speed Of Light Was First Measuredimage credit: McRobi1992 cc
The speed of light in a vacuum stands at 'exactly 299,792,458 metres per second.' The reason today we can put an exact figure on it is because the speed of light in a vacuum is a universal constant that has been measured with lasers; and when an experiment involves lasers, it's hard to argue with the results.
But how was the speed of light first measured?

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