On Wed 2003-01-29T15:43:24 -0700, Rob Seaman hath writ: > Please! Let's talk about ways to improve UTC and civil timekeeping. > And let's take the appropriate amount of time to reach a decision - > say - 40 or 50 years. In the mean time, let's pay attention to the > real question, which is how to build an infrastructure that will > dramatically improve the dissemination of all time signals.
Alas, we do not have 40 years, we have less than 35. The end of 32-bit Unix time is 2038-01-19T03:14:07. Well before that the Unixes of the future must have decided on the proper way to implement the algorithms for handling 64-bit time_t when receiving inputs from the NTP(s) of the future. Although there are many technical aspects to the situation, for practical purposes any change of UTC is legislation. Effective legislation seeks the common good while remaining congruent with the will of the people. When that will is split because of pre-existing practices and notions of what is good, the process inevitably becomes political. If this change is going to affect civil time, then, politically speaking, the 32-bit end of time is a looming deadline that should serve to motivate an answer about the fate of UTC within the next 10 years. In the mean time we may learn that a fifth fundamental force has implications for the spacetime metric that invalidate all the current time scales in use by astrophysics. As before, the response to that kind of paradigm shift in physical thinking would trigger the creation of yet more time scales to be used by astronomers. The old time scales would remain, unmodified, and less used. On Mon 2003-01-27T17:32:19 -0500, John Cowan hath writ: > I would have no problem with deciding now to change UTC, effective in 2033. Over that interval all the observatories in the world could assuredly handle any change. But in the context of the history of time scales, changing the character of UTC would still be the wrong thing to do. -- Steve Allen UCO/Lick Observatory Santa Cruz, CA 95064 [EMAIL PROTECTED] Voice: +1 831 459 3046 http://www.ucolick.org/~sla PGP: 1024/E46978C5 F6 78 D1 10 62 94 8F 2E 49 89 0E FE 26 B4 14 93