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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Chile and deltaT
From: George Huxtable
Date: 2010 Mar 3, 19:13 -0000
From: George Huxtable
Date: 2010 Mar 3, 19:13 -0000
Peter Hakel commented on a news item- http://www.msnbc.msn.com/id/35662192/ns/technology_and_science-space/?GT1=43001 This gave rise to an old-fashioned rant from Frank, which is copied below. I know nothing about the outfit that produced that report, but I can see nothing seriously wrong with the resulting article, which has appeared in similar form in various news outlets around the World including my "Guardian" this morning.. The only serious error was Peter's, in confusing the predicted change in day-length, correctly stated in microseconds, to refer to milliseconds. Indeed, the piece brought to my attention a fact that I was previously unaware of, the seasonal change in Earth spin-rate, over the year. The fit to the observations, provided by Seidelmann in the "explanatory supplement", which correspond to the plots provided by Richard Langley in 2004 that Frank has reminded us about, account for nearly a millisecond difference between the longest and shortest day. Exactly as the article stated. Indeed, the source, Richard Gross, pointed to cause as the momentum changes in atmospheric jet-stream, and ocean currents, just as I had hypothesised; though I seem to have seriously underestimated the magnitude of such effects. An example of Frank Reed denigration was his phrase about Gross; "supposedly of NASA JPL", who should for some reason be ashamed of himself. What was the "supposedly" intended to imply? Does he have any grounds for questioning that affiliation? But strangest of all was this criticism- "They're still pulling victims from the rubble in Chile, and people are profiting from death and destruction. They are profiting either directly in terms of the cash that the stories generate or indirectly by putting the media spotlight on some trivial research and the researchers who produce it." What, on Earth, has consideration of the geophysics involved, to do with whether or not they are still pulling victims from the rubble? George. contact George Huxtable, at george@hux.me.uk or at +44 1865 820222 (from UK, 01865 820222) or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. ----- Original Message ----- From: "Frank Reed"To: Sent: Wednesday, March 03, 2010 5:36 AM Subject: [NavList] Re: Chile and deltaT For your future reference, the folks who wrote that article work for space.com. This is a "barely there" news organization staffed by mediocre journalists who have a bad habit of getting the details wrong. They also excel at taking press releases literally. These supposed changes in the Earth's axis of rotation due to earthquakes are miniscule, well below the normal variations. Nearly the same crap was published by various media outlets a few days after the big Sumatra earthquake. I would contend that these stories and the press releases that generated them are in the same category as "ambulance chasing". They're still pulling victims from the rubble in Chile, and people are profiting from death and destruction. They are profiting either directly in terms of the cash that the stories generate or indirectly by putting the media spotlight on some trivial research and the researchers who produce it. Even if they had waited a year or so for the immediate tragedy to be well behind us, this is still little more than a "golly gee whiz" story. They didn't measure anything. It's not an observation of the Earth's rotation. It is merely output from a computer program. It does nothing to enlighten any reader's understanding of geophysics or the natural world generally. Richard Gross, supposedly of NASA JPL, and also the media who fed off this, should be ashamed of themselves. And I can guarantee you this: if this devastating earthquake had happened in Califonia, there would be no gee-whiz stories about such silly trivia. Please, Peter, do not think that any of the above applies to you. It applies to the people who produced the article, not those who read it. -FER