Received from IVP at 10/16/11 03:32 UTC: >>It's not the best analogy, but it does indicate that frame of reference i= s=20 >>important > >Hi Jim, > >my thinking was that relativity effects on GPS satellites and their slower= =20 >timekeeping is well understood and is compensated for, as your bunny watch= er=20 >would need to do > >http://en.wikipedia.org/wiki/Global_Positioning_System > >Refering to the section 'Precise Monitoring' > >I don't know what system CERN uses, but you might think it 'obvious' that= =20 >they'd first suspect GPS errors. They must surely have access to=20 >terrestrial clocks to determine propagation and latency times of their=20 >equipment, and especially before announcing a faster-than-light event > >Joe Hi Joe, Yes, it seems fairly obvious once explained after the fact. One would thin= k=20 the folks at CERN would have taken that into account. But thinking of it a= nd=20 then implementing it properly in software might be two different things. I= =20 think we had a NASA probe go astray years back over the use of US Customary= =20 vs CGS units in a single calculation. And then there was the hardware=20 problem with the Hubble mirror. Explanations for both fairly easily=20 comprehended by laymen after the fact, but missed - or mis-implemented - at= =20 the time by the experts. So complete omission or incomplete implementation= ,=20 I don't know. Anyhow, the article accounted for the deviation from Einstein's theory, but= I=20 don't recall it saying explicitly that they had actually found that this ha= d=20 been demonstrated to be *THE* actual source of error. The article says,=20 "...but they MAY [emphasis mine] have forgotten one critical thing:=20 relativity." I'd guess they did verify it wasn't accounted for, but are=20 being careful pending peer review. Bottom line? You won't go broke betting on Einstein. ;-) --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .