[time-nuts] Japan Quake May Have Shortened Earth Days, Moved Axis

Steve Rooke sar10538 at gmail.com
Thu Jul 14 14:26:37 UTC 2011


On 15 July 2011 02:08, Rob Kimberley <rk at timing-consultants.com> wrote:
> However, atomic time and "earth time" effectively drift apart, and that is
> why periodically we have leap seconds to bring the two closer together
> again. So we still need the astronomical measurements.
>
> Think of it as atomic time being the "linear" reference, and earth time a
> course saw tooth, which periodically comes into sync with the addition (or
> subtraction) of leap seconds.

Thanks, I was aware of this but my comment was that instead of the
usual need to add leap seconds, we perhaps may have a need to subtract
in the future should the world speed up significantly compared to it's
decaying rotation. The thought here is that event would be an
interesting test for the GPS disciplined clocks around the world.

Steve

> Rob K
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of J. Forster
> Sent: 14 July 2011 2:41 PM
> To: xformer at citynet.net; Discussion of precise time and frequency
> measurement
> Subject: Re: [time-nuts] Japan Quake May Have Shortened Earth Days, Moved
> Axis
>
> So?
>
> That statement clearly imlies the Earth's period was shortened aganst some
> standard.
>
> If the Earth was the standard, how could it be shortened with respect to
> itself?
>
> It can't be. Time standards are atomic now.
>
> -John
>
> ===================
>
>
>> "Calculations indicate that by changing the distribution of Earth's
>> mass, the Japanese earthquake should have caused Earth to rotate a bit
>> faster, shortening the length of the day by about 1.8 microseconds".
>>
>> http://www.nasa.gov/topics/earth/features/japanquake/earth20110314.htm
>> l
>>
>> Will
>>
>>
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>
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-- 
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.
- Einstein



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