Re: [LEAPSECS] Stupid question from programmer: Why not just eliminate ALL UTC corrections ?

From: Mark Calabretta <mcalabre_at_ATNF.CSIRO.AU>
Date: Fri, 05 Aug 2005 14:18:29 +1000

On Thu 2005/08/04 19:44:04 MST, Scott Moore wrote
in a message to: LEAPSECS_at_ROM.USNO.NAVY.MIL

>for the next 100 years or so without appreciable variation. It would even
>allow the computer to calculate what the leap seconds are, if they would
>(apparently) stop messing with the system and leave it as a standard rule
>based system. Without a table at all.

Although we have a reasonable idea of long-term trends, the problem is
that noone can predict exactly what the Earth will do. The current
anomalous speedup in its rotation is thought to be caused by upwelling
of magma in the mantle with consequent change in the Earth's moment of
inertia: not predictable.

The Boxing day tsunami introduced a time glitch: not predictable.

Melting of the polar ice caps and rising sea levels will change the
Earth's moment of inertia: not predictable.

Interior geophysics, crustal dynamics, earthquakes, tsunamis, El nino,
global warming, etc. all could potentially cause irregularities: not
predictable, not now nor in the foreseeable future.

Mark Calabretta
Received on Thu Aug 04 2005 - 21:18:54 PDT

This archive was generated by hypermail 2.3.0 : Sat Sep 04 2010 - 09:44:55 PDT