How is the definition of the meter currently established in relation to the speed of light?
Answer
The distance light travels in a vacuum in $1/299,792,458$ of a second
Since the 1980s, the meter has been defined based on the speed of light; it is the distance light covers in $1/299,792,458$ of a second, effectively fixing $c$ at exactly $299,792,458$ meters per second.
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