On Dec 19, 2010, at 11:22 AM, Joe Gwinn wrote:

> At 10:47 AM -0700 12/19/10, Rob Seaman wrote:
> 
>> Currently DUT1 is negligible for many purposes - this won't remain the case.
> 
> In my career, I have encountered exactly one system that even knew what DUT1 
> is, and even so DUT1 was handled in application code, in the one place that 
> could even understand the question.

Thanks for emphasizing my point.  The current absence of evidence is not 
evidence for the lack of future problems.  That UTC, as an implementation of 
Universal Time, approximates Greenwich Mean Time is an assumption deeply built 
into the fabric of systems and software and social procedures worldwide.

> The problem is that our various lists of advantages and disadvantages are not 
> the same, so no single answer can work for all.

The problem is that the ITU has spent ten years unilaterally pursuing a 
non-answer.  We've actually achieved a lot of consensus-building here, but you 
wouldn't know it because there is only this single Damoclean option hanging 
over our heads.

It is unsurprising that no "single answer" is available.  That's because 
timekeeping comes in two flavors - interval timers and Earth orientation.  True 
solutions will recognize this fact - either explicitly along the lines 
suggested by Steve Allen, or implicitly by minimizing the required maintenance 
through better scheduling as outlined by PHK.  Interestingly enough, both of 
these options can be pursued without changing UTC at all.

Define a new timescale.  Call it "TI", or "Coordinated Pan-Cosmic Time" if you 
like.  Declare victory.  Turn to the underlying and more interesting issues of 
building a bettor temporal mousetrap.

> The ITU, a creature of governments, will decide on the basis of what's best 
> for the larger civil society, 

Bwahahaha!  ...mopping tears from my eyes...  The ITU is not considering issues 
of "civil society" at all.  They are listening to the imagined self-interests 
of one particular highly technical lobby suffering from tunnel vision.

> even at the expense of the sciences, astronomy being especially affected.


...well, that's certainly true :-)

Rob
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