[time-nuts] UTC and leap seconds

[iovane at inwind.it]

Beside the general theoretical considerations as of what answer is more 
acceptable (sincerely I agree so far)  and  what method could be used to solve 
the matter, can anybody out there point me please to any article on actual 
measurements of the variation rate of the earth's rotational speed, not based 
on clocks?

(Speculative hint: We accept that the universe is expanding. Might this affect 
the fine structure of matter, including cesium atoms? Is there any adverse 
proof? What is easier to think? a) the expansion of the universe doesn't affect 
at all the properties of matter. b) it might.).

Cheers,
Antonio I8IOV