28 Mar
2013
28 Mar
'13
12:33 p.m.
Naturally, since the speed of light is constant by definition, it must be the length of a meter that potentially can vary. --Dan On 2013-03-27, at 7:50 PM, Keith F. Lynch wrote:
I'm not sure what this would even mean. Since 1983, SI has defined the length of the meter in terms of the speed of light and the length of the second. So the speed of light in a vacuum as a constant by definition.