nanog mailing list archives

RE: F-ckin Leap Seconds, how do they work?


From: "Keith Medcalf" <kmedcalf () dessus com>
Date: Tue, 03 Jul 2012 16:56:13 -0600

Tony Finch <fanf2 () hermes cam ac uk> wrote:

Keith Medcalf <kmedcalf () dessus com> wrote:

You are assuming facts not in evidence.  The rotation is merely
irregular within the capabilities of our scheme of measurement,
calculation, and observation.

There is LOTS of evidence that the earth's rotation is irregular. VLBI,
laser ranging of the moon, etc. This was known long before the atomic
clock was invented, and it is why the definition of the second was changed
from one based on earth rotation to one based on Newcomb's ephemerides,
before the change to an atomic second.

What you mean is that it is subject to periodicities and forces which you do not understand, and that within your 
limited perception, this ignorance is taken as "irregularity".  Just because the system encompasses rules and 
properties beyond your understanding and observation does not mean that it is magic.

It is impossible for the earth's rotation to be irregular, just as it is impossible for the orbit around the sun to be 
irreglar, or the orbit of the solar system within the galaxy, or the galaxy within the universe, or the universe within 
the multiverse, to be irregular.

The irregularity is due to inability to comprehend the rather simple set of rules governing the motion, or failures of 
observation.

Once upon a time (not too long ago) the orbit of Pluto was thought to be "irregular".  It was not.  There was another 
body right where it would be expected to be found affecting the orbit of Pluto.  All that was required to "discover" it 
was someone who applied logical thought processes rather than magical thought processes to the observed data.

The earth's rotation and orbit is perfectly regular.  Your error is one of assumption and a failure to admit that your 
knowledge is imperfect.

** "your" is the general y'all, not you in particular **

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