At the 17th International Heart General Assembly in 1983, it was determined that a metre is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.
At the 17th International Heart General Assembly in 1983, it was determined that a metre is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.