On Jan 7, 2006, at 8:02 AM, Poul-Henning Kamp wrote:
I have no problems with different timescales for different purposes.
Great! Consensus reached! Rejoicing in all the lands! May one suggest a parade in celebration? The great Parade of the Leap Seconds! To be held on December 31 or June 30 as the spirit moves us (or January or July 1, for those east of Greenwich.) Now, what would that be in French? La Parade du Saut de Seconde?
For instance I very much wish the Astronomers would start to use UT1, which is very much "their" timescale, and stop abusing UTC, which isn't, as a "convenient approximation".
...ohhhh - should have stopped while you were ahead. Astronomers use UT1. Astronomers use UTC. Astronomers are among the biggest users of TAI and GPS and likely any other timescale you care to name. Our community cares deeply about time. How precisely does this disqualify us from participating in the process? By your logic, the U.S. Surgeon General should be a chiropractor.
Civil time is in the hands of individual governments, and they tend to expect their computers to use the same time as the rest of their country.
The proper response to this comes down to us from the staid and proper British, inheritors of the immortal legacy of Shakespeare and Dickens: Bollocks! (http://en.wikipedia.org/wiki/Bollocks) We can incessantly debate trivialities, or we can seek a grand vision of the shared meaning of time in human concerns. I presume everybody here is competent to perform the conversions between different local clocks. Some have been instrumental in the construction of new systems of time for manifold scientific, technical and civil purposes. The following assertion thus falls flat:
Nobody here is in any position to do anything about civil time or legal time, neither are we in a position to introduce a "computer time scale" in a pathetic attempt to paste over leap seconds.
Geez! Cut the guy a break for coming late to the discussion. For his first posting, he has already elucidated a central issue of the debate. Would be nice if the ITU were debating the issues raised by Kuhn and Sokolov, rather than engaging in the political shenanigans you appear to applaud. ...but your upbeat speech has won my vote if you choose to run for student body president. For six years we've pretended that Coordinated Universal Time, and thus the concept of a leap second, is some extremely complicated issue of import only to technical wonks like us. Balderdash. It's fine if you want to challenge my definitions for particular terms. Fine, fine, fine. So instead of "Civil Time" and "Solar Time", slap new names on my definitions: Canoli = common basis for diverse time usage worldwide Eclair = baseline representation of Earth orientation Unless we *completely* change our notion of Canoli, Canoli is tightly constrained to follow Eclair simply by the fact that today and tomorrow and the million days that follow are all required to be dark at night and light in the day. Whether we choose to bleed off the daily accumulating milliseconds one second or 3600 at a time, bleed them we must...and even people who loathe the very notion of leap seconds admit this. (The craven ITU proposal is obligated to pay lip service to leap hours, though what they really are saying is "let's close our eyes and wish it away".) Time to move on. Or another analogy: Canoli is an arrow, Eclair its target. Canoli can be arbitrarily small, Eclair arbitrarily distant. Canoli is constrained to fly straight, thus an arbitrarily small choice of aiming options will result in hitting Eclair. Or consider the network time protocol. NTP can update the local clock on an arbitrary schedule. Two popular choices are daily on the one hand and "continuously" on the other. I suspect we dastardly astronomers are not alone in preferring the latter (small, frequent, fractional "leaps") rather than the former (large, rare, colossally arbitrary jumps). Rob Seaman National Optical Astronomy Observatory