IMO, that would be a disaster for all areas of physics and engineering, except for possibly some aspects of astronomy.
When they 'redefined' the Volt some years ago it was a goat rodeo. -John =================== > So what you are saying is every 30 years select a new leap CS reference. > Dispense with everything in between. > > On Fri, May 11, 2012 at 2:21 PM, Tom Van Baak <t...@leapsecond.com> wrote: > >> > Are there better estimates of the ET second nowadays (relative to the >> > SI second)? It would be interesting to know what the cesium frequency >> > "should have been" if much better estimates of the ephemeris-time >> > second were available at the time. >> >> Hi Peter, >> >> Everyone should take ten seconds and look at this animated GIF: >> http://leapsecond.com/pages/ut/ut-ani-v2.gif >> >> It shows what would have happened to "earth time" vs. "atomic time" if >> the >> cesium frequency had been defined to be other than 9192.631770 MHz. As >> you can see a slightly higher number would have meant less deviation >> between the two timescales. >> >> However it should also be clear, even with this short 40-year plot, that >> no number is the best or correct or right choice. It all depends on >> which >> year(s) you choose to base your earth rotation rate calibration on (the >> astronomers doing the calibration in the 1950's selected the year 1900 >> as >> their baseline). >> >> To see each page at your own pace here is it as a multi-page PDF file: >> http://leapsecond.com/pages/ut/ut-ani-v2.pdf >> >> If you wanted a near perfect match between atomic time and the rotation >> of >> the earth during the 1970's hindsight tells you the frequency should >> have >> been 9192.632080 MHz. Similarly if your crystal ball said to use >> 9192.632010 you would have been very close for three decades. If you >> wanted the best time accuracy from the year 1972 to present you should >> have >> picked 9192.631950. >> >> /tvb >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.