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http://www.ldeo.columbia.edu/users/jcm/Topic2/Topic2.html which
Check out
is the source for the following:amoints that
2.5 Length of Day Variations.
While it might seem fairly incredible the length of the day is
changing all
the time -- not by an amount that anyone would notice, but by
are easy to detect instrumentally. The changes are only a fewmilliseconds
(a millisecond is one thousandth of a second) but they are very easy tovariations and
measure. The record below shows that there are very regular
also very irregular variations. All of the changes must in some way bewinter. Longer
caused by the re-distribution of mass over the surface and with in the
Earth. Seasonal changes (curve d) are caused by the change in ice
volume and
relative amounts of water in the atmosphere from summer to
period changes and shorter period changes (curves c and eEl Nino --
respectively) are
more difficult to explain. Some are caused by the phase of the
the Earth rotates differently in an El Nino year than in a La Nina yearin the deep
because these phenomena change the distribution of wet and dry
parts of the
world. Even longer period changes must be caused by processes
Earth that move masses around such as subduction of large slabs ofrotational
lithosphere. The cause of many of the longer period signals is not well
understood.
----- Original Message -----
From: "E.C. Muehleisen" <docmule@HOTMAIL.COM>
To: <PHYS-L@lists.nau.edu>
Sent: Monday, December 31, 2001 3:15 PM
Subject: Earth's rotational speed
I have been aware that the earth's speed about the sun variesas we travel
on our elliptical path. However, I have read that the earth's
speed varies though the year. Would someone be so kind as toexplain this
change in omega and also explain the implications on L and theconservation
of angular momentum.quote:"Sometimes I
Perhaps this will prompt a return to things of physics rather than
government.
Then a last barb on the much ballyhooed tax "rebate." A
wonder if the world is being run by smart people putting us on or by
imbeciles who really mean it."
Too much of a good thing is wonderful!
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