Re: Measurements revisited

Nik Taylor wrote:

> > Distance makes more sense to me as a basic unit rather than deriving it
> > from speed and time, because of the relative ease of measuring distance.
Actually not.  We can measure time far more precisely now, and so
the meter was redefined in 1983 thus:

        The metre is the length of the path travelled by light in
        vacuum during a time interval of 1/299792458 of a
        second.

A consequence is that the speed of light is now a defined, not a
measured, quantity!

--
John Cowan      http://www.ccil.org/~cowan              cowan@ccil.org
        You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
        You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
                Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)