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Sorry, but for the avoidance of confusion, you are thirty years out of
date.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.
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