Re: Earth Deceleration theory likely a farce

On Fri, 16 Jan 2009 22:11:08 -0500, Dave Typinski <möbius@xxxxxxxxxxxxx>
wrote:

Really? I can see small short term (decades, centuries) fluctuations
dues to the changes in Earth's moment of inertia... but long term
(eons), one might guess that the overall deceleration would be close
to the predicted curve.

Of course, mother nature may have other ideas... ;-)

I expect she does. The thing is, even if you are really, really close,
you still have the problem that the positional (delta-T) error
accumulates as you integrate. And in fact, I don't even think there is a
predicted curve, because things like the total weight of ice near the
poles have a pretty significant impact on our angular velocity, and we
don't know how to determine that for most of the Earth's existence.

Lets say your watch is gradually running slower, and you can measure
that error rate very accurately. But lets also figure that your watch
has an additional rate inaccuracy that depends on the temperature. You
can predict with excellent accuracy how fast your watch will be running
in the far future (or how fast it was running in the distant past), but
you won't be able to accurately predict the actual time that was
displayed.
_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
.

Relevant Pages

  • Re: Earth Deceleration theory likely a farce
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