In message , at 11:32:43 on
Sun, 22 Aug 2004, Peter Sumner
remarked:
NPL say http://www.npl.co.uk/time/ "Home of the nation's atomic time
scale" and "providing the UK time scale related to UTC ", in both
cases its "the" time scale rather than just "a" time.

But go on to say:

"Universal Time (UT) now has three separate definitions (UT0,
UT1, UT2) depending on which corrections have been applied to
the Earth's motion. Authorities are not agreed on whether GMT
equates with UT0 or UT1, however the differences between the two
are of the order of thousandths of a second.

Meanwhile, they are wrong to imply that UTC is the legally accepted
time; unless someone has deliberately "dumbed down", for their Homepage,
the choice between UT0/UT1 and called that UTC.

--
Roland Perry