KalleK wrote:

>> How the HECK did they measure that o_O
> 
> It's defined that way: one meter is the 1/299 792 458 part of what light 
> travels in one second in vacuum...
> 
> (Well one meter was defined differently in former times...)

Sweet!

So how do they define 1 second? (IIRC, isn't it the amount of time it 
takes for the Sodium D-line to go through some defined number of 
oscilations or something?)

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