Re: two world clocks AND Time after Time

2005-01-25 Thread Steve Allen
On Tue 2005-01-25T09:57:46 +, Clive D.W. Feather hath writ: > I think you're out by a factor of 10. Would the Man On The Clapham Omnibus > be able to identify the solstice or equinox to within 14 days? Other than > knowing the "conventional" dates? > > [That is, if the equinox was actually on M

Re: two world clocks AND Time after Time

2005-01-25 Thread Poul-Henning Kamp
In message <[EMAIL PROTECTED]>, "Clive D.W. Feather" writes: >Poul-Henning Kamp said: >>> [That is, if the equinox was actually on March 9th, would anyone outside >>> the astronomical community notice?] >> >> I doubt it. >> >> I'm not so certain about the summer and winter solstice however. >> here

Re: two world clocks AND Time after Time

2005-01-25 Thread Clive D.W. Feather
Poul-Henning Kamp said: >> [That is, if the equinox was actually on March 9th, would anyone outside >> the astronomical community notice?] > > I doubt it. > > I'm not so certain about the summer and winter solstice however. > here in the nordic countries were're quite emotionally attached to > thos

Re: two world clocks AND Time after Time

2005-01-25 Thread Poul-Henning Kamp
In message <[EMAIL PROTECTED]>, "Clive D.W. Feather" writes: >Tom Van Baak said: >> It seems to me the popular understanding of a year >> is accurate to +/-1 day. > >I think you're out by a factor of 10. Would the Man On The Clapham Omnibus >be able to identify the solstice or equinox to within 14

Re: two world clocks AND Time after Time

2005-01-25 Thread Clive D.W. Feather
Tom Van Baak said: > It seems to me the popular understanding of a year > is accurate to +/-1 day. I think you're out by a factor of 10. Would the Man On The Clapham Omnibus be able to identify the solstice or equinox to within 14 days? Other than knowing the "conventional" dates? [That is, if th

Re: two world clocks AND Time after Time

2005-01-24 Thread John Cowan
Tom Van Baak scripsit: > Another observation is that our local newspaper always > prints Sun and Moon rise and set times. But not time > of noon. Why is this? Maybe it's just our paper (noon > implies sun and we don't see much of it here in Seattle). Some people need to know sunset for religious

Re: two world clocks AND Time after Time

2005-01-24 Thread John Cowan
Steve Allen scripsit: > What we are being told by the Time Lords is that, starting from a date > in the near future, knowing when noon is will also be a specialist > operation. Already true. For many months of the year, solar noon is closer to 1 PM, or even 1:30 PM, in a great many countries, an

Re: two world clocks AND Time after Time

2005-01-24 Thread Poul-Henning Kamp
In message <[EMAIL PROTECTED]>, Steve Allen writes: >On Mon 2005-01-24T00:50:10 -0800, Tom Van Baak hath writ: >> Isn't knowing when noon is already a specialist operation? >> I mean, most people could tell you when noon is to within >> an hour or two or three, but finer than that requires a far >>

Re: Time after Time

2005-01-24 Thread Poul-Henning Kamp
In message <[EMAIL PROTECTED]>, Markus Kuhn writes: >You surely must have seen my detailed UTS proposal for how UTC leap >seconds should be handled trivially and safely by the overwhelming >majority of computer applications, without any special considerations >whatsoever by normal application prog

Re: Time after Time

2005-01-24 Thread Markus Kuhn
Poul-Henning Kamp wrote on 2005-01-24 09:32 UTC: > In message <[EMAIL PROTECTED]>, Markus Kuhn writes: > > >In summary: There are basically three proposals on the table: > > > > a) Keep UTC as it is (|UTC - UT1| < 900 ms) and just make TAI more > > widely available in time signal broadcasts >

Re: Time after Time

2005-01-24 Thread Poul-Henning Kamp
In message <[EMAIL PROTECTED]>, Markus Kuhn writes: >In summary: There are basically three proposals on the table: > > a) Keep UTC as it is (|UTC - UT1| < 900 ms) and just make TAI more > widely available in time signal broadcasts > > b) Move from frequent UTC leap seconds to far less freque

Re: two world clocks AND Time after Time

2005-01-24 Thread Steve Allen
On Mon 2005-01-24T00:50:10 -0800, Tom Van Baak hath writ: > Isn't knowing when noon is already a specialist operation? > I mean, most people could tell you when noon is to within > an hour or two or three, but finer than that requires a far > amount of daily mental calculation, no? Noon has long r

Re: two world clocks AND Time after Time

2005-01-24 Thread Poul-Henning Kamp
In message <[EMAIL PROTECTED]>, Tom Van Baak writes: >Another observation is that our local newspaper always >prints Sun and Moon rise and set times. But not time >of noon. Why is this? Maybe it's just our paper (noon >implies sun and we don't see much of it here in Seattle). > >Why is the instant

Re: two world clocks AND Time after Time

2005-01-24 Thread Markus Kuhn
Steve Allen wrote on 2005-01-24 06:09 UTC: > But the current strategy of retaining the name UTC creates one real > and unresolvable problem that will persist indefinitely. It is very > bad policy to corrupt the historical meaning of anything called > "Universal Time" by redefining UTC to be someth

Re: Time after Time

2005-01-24 Thread Markus Kuhn
John Cowan wrote on 2005-01-23 18:37 UTC: > Markus Kuhn scripsit: > > > UTC currently certainly has *no* two 1-h leaps every year. > > There seems to be persistent confusion on what is meant by the term > "leap hour". Why? > I understand it as a secular change to the various LCT offsets, > made e

Re: two world clocks AND Time after Time

2005-01-24 Thread Tom Van Baak
Steve, Some comments on your fine posting... > But Essen claims for himself (in both this autobiography > and in Metrologia I found the Metrologia article interesting. I had heard of 100 ms steps (leap tenth-seconds) but not the 50 ms steps. Did you notice he appears to refer to a leap second w

Re: two world clocks AND Time after Time

2005-01-23 Thread Steve Allen
On Thu 2005-01-20T14:59:18 -0700, Rob Seaman hath writ: > Leap seconds are a perfectly workable mechanism. Systems > that don't need time-of-day should use TAI. Systems that do need > time-of-day often benefit from the 0.9s approximation to UT1 that UTC > currently provides. Let's stop pretendin

Re: Time after Time

2005-01-23 Thread John Cowan
Markus Kuhn scripsit: > UTC currently certainly has *no* two 1-h leaps every year. There seems to be persistent confusion on what is meant by the term "leap hour". I understand it as a secular change to the various LCT offsets, made either all at once (on 1 Jan 2600, say) or on an ad-lib basis.

Re: Time after Time

2005-01-23 Thread Markus Kuhn
Poul-Henning Kamp wrote on 2005-01-23 09:00 UTC: > >any "leap > >hours" that prevented this would, if ever implemented, be even more > >traumatic than leap seconds are now. > > they already happen here twice a year, and by now even > Microsoft has gotten it right. OBJECTION, your Time Lords! UTC

Re: Time after Time

2005-01-23 Thread Poul-Henning Kamp
In message <[EMAIL PROTECTED]>, "Daniel R. Tobias" writes: >Some of the proposals, however, seek to decouple civil time >altogether from solar time, an unprecedented step which would >possibly lead to day and night being completely reversed; any "leap >hours" that prevented this would, if ever imp

Time after Time

2005-01-22 Thread Daniel R. Tobias
I sure hope that the future of mankind's timekeeping systems doesn't get decided by an Internet flame war between contending groups of geeks... As I see it, the dispute comes from the fact that people want two different, irreconcilable types of "time", time of day (earth/solar angle) and constant