[tz] Earth's day lengthens by two milliseconds a century

vanadovv at hetnet.nl vanadovv at hetnet.nl
Thu Dec 8 21:34:21 UTC 2016

I think it would be better to refer to the original paper, which can be found free online.

Measurement of the Earth's rotation: 720 BC to AD 2015
F. R. Stephenson, L. V. Morrison, C. Y. Hohenkerk
Published 7 December 2016.DOI: 10.1098/rspa.2016.0404


Oscar van Vlijmen

>----Origineel Bericht----
>Van : eggert at cs.ucla.edu
>Datum : 08/12/2016 21:43
>Aan : elseifthen at gmx.com
>Cc : tz at iana.org
>Onderwerp : Re: [tz] Earth's day lengthens by two milliseconds a century
>Thanks for the heads-up; I installed the attached patch into the 
>development repository.
>When this news was published in today's Los Angeles Times, commenters 
>jumped on the story and said that the math was all wrong, and that a 
>7-hour error after 2500 years cannot possibly be caused by an increase 
>of the length-of-day by an average of 1.8 ms/century (i.e., 18 
>μ/s//year). The amusing thing wasn't merely that the commenters were 
>scientifically illiterate: it was that they were sure they were right, 
>that the "liberal" media were wrong, and that this had something to do 
>with global warming being a hoax.
>For what it's worth, the only paper I found on the subject of 
>human-caused global warming's effect on the length-of-day estimated an 
>increase on the order of 1 μ/s//year, mostly due to an increase in the 
>estimated mean zonal wind between 10–60 degrees of latitude. See:
>de Viron O, Dehant V, Goosse H, Crucifix M. Effect of global warming on 
>the length-of-day. Geophys Res Lett 2002 Apr 12;29(7):50-1–4. 

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