Le 12 juil. 2013 à 14:57, Rob Seaman a écrit : > FYI. > > The direct link is: > > > http://www.iers.org/nn_317904/SharedDocs/Publikationen/EN/IERS/Documents/IERS__Leap__Seconds,templateId=raw,property=publicationFile.pdf/IERS_Leap_Seconds.pdf > > Presumably all parties will welcome the IERS improving its products: > >> Future considerations >> >> In recognition of rapidly changing technology, the IERS recently held a >> retreat in order to better position the IERS to meet the emerging needs of >> its users. As part of this retreat, the IERS agreed to create new products, >> utilizing more modern data file formats that should improve usability of the >> IERS data. In addition, the IERS will investigate the possibility of >> creating a real-time EOP transfer protocol. This latter product would >> provide UT1 directly to users that currently choose to approximate UT1 using >> UTC. It would have the advantage of maintaining the same simplicity of >> implementation that users currently enjoy while increasing the accuracy of >> the data by more than four orders of magnitude at no cost to the user. The >> IERS is prepared to meet any future requirements of users by the most >> convenient means.
Excellent news. Maybe they should be clear on some requirements before creating a protocol. I wonder how they are going to go about selecting them. > And presumably all parties will welcome a schedule to pin down the precise > meaning of "future". > It seems a general rule that infrastructure should be deployed and tested > before being required operationally. > > However, "whether the current definition of UTC is retained or whether UTC is > redefined to eliminate leap seconds" are not the only two positions on the > issues. For instance, such improvements would equally well support the 2003 > Torino consensus of creating and disseminating a new time scale, > "International Time". Among other things, this would permit the current > definition of UTC to be retained for backwards compatibility, mitigating many > risks. > > Also users (and their customers) didn't just happen to "choose to approximate > UT1 using UTC", rather this choice was made for them. UTC was created for > this purpose: "GMT may be regarded as the general equivalent of UT." The > family of Universal Time is a spectrum of solar time scales. > > The ITU should create different time scales absent the long established > sobriquet of "Universal Time" for any newly conceived non-solar > radio-communications purpose(s) – or perhaps consider disseminating a > TAI(ITU) directly. The most efficient and least risky solution is to focus > incrementally on improving support for current time scales. I don't think that the ITU are a good choice for creating time scales. I think they should be just charged with defining dissemination. > > Many thanks to the IERS for seeking to quiet the confusion that the ITU-R has > brought to civil timekeeping. echo that, though I would replace "confusion" with "controversy". It is hardly their fault that humans can't integrate a very simple solution to maintaining civil time roughly equal to UT1. > > Rob > -- > > Begin forwarded message: > >> From: <[email protected]> >> Subject: IERS Message No. 233: The Role of the IERS in the Leap Second >> Date: July 11, 2013 11:20:09 PM MST >> To: <[email protected]> >> >> ************************************************************************ >> IERS Message No. 233 July 12, 2013 >> ************************************************************************ >> >> >> The Role of the IERS in the Leap Second >> >> >> An article by Brian Luzum, Chair of IERS Directing Board, on "The Role >> of the IERS in the Leap Second", will be published in the ITU News >> Magazine. A preview version of this article is now available at >> >> http://www.iers.org/biblio >> >> >> The summary reads: >> >> The IERS has served the international scientific community and >> operationally oriented efforts through its service for more than >> twenty-five years. This includes providing Earth orientation >> information, algorithms and software to utilize EOPs, and leap second >> notifications to the world. With recent efforts, the IERS has positioned >> itself to more completely serve the needs of its users whether the >> current definition of UTC is retained or whether UTC is redefined to >> eliminate leap seconds. Either way, the ITU can rely on the IERS to >> support its users with the data and software needed. >> >> Kind regards, >> IERS Central Bureau >> >> >> ************************************************************************ >> IERS Messages are edited and distributed by the IERS Central Bureau. >> If not stated otherwise, the IERS is only the distributor of the message >> and is not responsible for its content. >> To submit texts for distribution and to subscribe or unsubscribe, >> please write to <[email protected]>. >> Archives: http://www.iers.org/Messages/ >> ************************************************************************ > _______________________________________________ > LEAPSECS mailing list > [email protected] > http://six.pairlist.net/mailman/listinfo/leapsecs
_______________________________________________ LEAPSECS mailing list [email protected] http://six.pairlist.net/mailman/listinfo/leapsecs
