[LEAPSECS] LEAPSECS Digest, Vol 169, Issue 10

[Demetrios Matsakis]

I’ve attached a plot of the best data I know, going way back. 
It should be self-explanatory.   Observational noise does not contribute to the data.



> On Jul 27, 2022, at 5:36 AM, leapsecs-request at leapsecond.com wrote:
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> Today's Topics:
> 
>   1. Re: fb/meta join the leap second haters (Poul-Henning Kamp)
>   2. Re: fb/meta join the leap second haters (Tom Van Baak)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 27 Jul 2022 06:35:31 +0000
> From: "Poul-Henning Kamp" <phk at phk.freebsd.dk>
> To: Leap Second Discussion List <leapsecs at leapsecond.com>, Steve Allen
> 	<sla at ucolick.org>
> Subject: Re: [LEAPSECS] fb/meta join the leap second haters
> Message-ID: <202207270635.26R6ZVHn005733 at critter.freebsd.dk>
> Content-Type: text/plain; charset="us-ascii"
> 
> --------
> Steve Allen writes:
>> On Tue 2022-07-26T23:33:15+0000 Poul-Henning Kamp hath writ:
>>> So looking at the IERS LOD plot going all the way back it seems to
>>> me that we have been missing the big signal for about five decades:
>>> 
>>>      https://datacenter.iers.org/singlePlot.php?plotname=EOPC04_14_62-NOW_IAU2000A-LOD&id=224
>>> 
>>> How did we not notice that earlier ?
>> 
>> even better is the view from the Paris bureau at
>> https://hpiers.obspm.fr/eop-pc/index.php
>> which at the moment is showing a Vondrak filtering
> 
> But only from 2000 forward, would be interesting to see it
> for the full data-set.
> 
>> The rotation of the earth's crust started accelerating right when
>> the CCIR decided that we should start using leap seconds.
> 
> Yes, it does indeed look like 1970-ish is a turning point, but it
> is always dangerous to declare such to close to the end of the
> data...
> 
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe    
> Never attribute to malice what can adequately be explained by incompetence.
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Wed, 27 Jul 2022 02:27:27 -0700
> From: Tom Van Baak <tvb at LeapSecond.com>
> To: leapsecs at leapsecond.com
> Subject: Re: [LEAPSECS] fb/meta join the leap second haters
> Message-ID: <c15e8b7d-198d-1cf8-26c6-b86812697cb1 at LeapSecond.com>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
> 
>> But only from 2000 forward, would be interesting to see it
> 
> Steven mentioned:
> 
>> https://hpiers.obspm.fr/eop-pc/index.php
>> which at the moment is showing a Vondrak filtering
> 
> "at the moment" is the key; it seems the plot at that URL varies outside 
> the control of the visitor. I captured the plot as Steve saw it:
> 
> /tvb
> 
> 
> On 7/26/2022 11:35 PM, Poul-Henning Kamp wrote:
>>> even better is the view from the Paris bureau at
>>> https://hpiers.obspm.fr/eop-pc/index.php
>>> which at the moment is showing a Vondrak filtering
>> But only from 2000 forward, would be interesting to see it
>> for the full data-set.
>> 
> 
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> ------------------------------
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> End of LEAPSECS Digest, Vol 169, Issue 10
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