On Thu, 27 Feb 2003, Johnathan McClure wrote: > You see what I meant? As I said before, we should not risk having such an > unstable measurement as a basis for a unit...
You forget, Johnathan, that in SI, c is now a *defined* constant. It is no longer a measured quantity. Stability of measurement of c is no longer an important question. However, the precision and stability of groups of atomic clocks is an important question for measuring distances. e.g. for GPS applications. Gene.
