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At 10:13 28/08/2013 -0400, James Knott wrote:
The kilometre [...] is currently determined by the wavelength of light emitted by the kry[p]ton-86 items.

Sorry, but for the avoidance of confusion, you are thirty years out of date. Since 1983, the metre has been defined as the distance travelled by light _in vacuo_ in a specified time. This has the effect of *defining* the value of the speed of light, of course.

Brian Barker

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