[time-nuts] UTC and leap seconds

Poul-Henning Kamp phk at phk.freebsd.dk
Fri Jun 11 06:39:07 EDT 2010


In message <20100611102543.67641136087 at hamburg.alientech.net>, Mike S writes:
>At 06:03 AM 6/11/2010, Poul-Henning Kamp wrote...

>I assume you mean use a clock to measure the earth's rotation, using 
>quasars as a positional reference. That's circular logic.

Obviously, any measurement of earths rotation has to involve
circular logic :-)

If time changed rate fast enough to explain the observed changed
rate of earths rotation, we would long ago have measured drifts
in other fundamental natural constants which involve time.

For instance spectral emission lines from atoms in distant astronomical
objects.

If these other constants "magically" changed at the necessary
complimentary rate, then we are back at the old joke:

"If somebody took away all of reality last night, and replaced it
with an exact copy, how could you tell ?"

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.




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