Re: pedagogically barren?

2003-06-06 Thread Peter Bunclark
I'd be interested to hear how one measures the leading edge of the human life to death transition pulse with a precision that makes the UT1 vs. UTC question even relevant. A husband has a will leaving everything to his wife, or if she dies first, to their children. The wife has a will

Re: DRM broadcast disrupted by leap seconds

2003-07-21 Thread Peter Bunclark
On Sat, 19 Jul 2003, Markus Kuhn wrote: All modern digital broadcast transmission systems introduce significant delays due to compression and coding. It is therefore common practice today that the studio clocks run a few seconds (say T = 10 s) early, and then the signal is delayed by digital

Re: Precise time over time

2005-08-11 Thread Peter Bunclark
Surely the point about the slaughterhouse is the thought of the throat slasher getting a couple of seconds ahead of the brain stunner. As for the issue of whether the slaugherhouse needs syncing to an external clock, the point is that with the prevelance of ntp, it is just as easy, or easier,

Re: Consensus rather than compromise

2005-08-30 Thread Peter Bunclark
On Tue, 30 Aug 2005, M. Warner Losh wrote: Leap seconds cost actual companies lots of $$$. I know that I've personally put in about 50 hours to leap second issues since July 1, and others in my company have put in even more in testing, shipping equiptment to the simulator facility, writing

The Trouble with POSIX

2005-09-30 Thread Peter Bunclark
I present below a distillation of many of the comments which mention POSIX from the leapsecs mailing list. I apologise unashamedly for my cuts and selections, and apologise profusely on the off chance I got the attributions wrong. I started doing this for my own use, but then thought perhaps some

Re: BBC - Leap second talks are postponed

2005-11-18 Thread Peter Bunclark
On Fri, 18 Nov 2005, Ed Davies wrote: On the other hand, I rather snigger at the reservation of the word universal to mean time based on the Earth's rotation. It's all rather parochial but it is the established terminology. Doesn't Universal hint at the join of the SI second and Solar Time?

Symmetricom

2005-12-01 Thread Peter Bunclark
Interesting to see a commercial company using leap seconds as a positive marketing play. Pete. -- Forwarded message -- Date: Thu, 1 Dec 2005 10:02:01 -0500 From: Symmetricom TTM Division [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject:

Re: a system that fails spectacularly

2005-12-09 Thread Peter Bunclark
On Fri, 9 Dec 2005, Clive D.W. Feather wrote: boundary than to deal with stuff coming in. In other words, it's easier to only buy widgets from ISO 9000 compliant suppliers than to provide an inbound widget quality test department. From what I understand from some of the recent emails, you

Re: text book example why Leapseconds are bad

2006-01-03 Thread Peter Bunclark
Jan 2006, Randy Kaelber wrote: On Tue, Jan 03, 2006 at 07:42:31AM +, Peter Bunclark wrote: And these Rocket Scientists can't even spell. Perhaps they can't read, I hope you are now aware that your spelling on this list from this point forward now needs to be flawless. ;-) -- Randy

Re: The opportunity of leap seconds

2006-01-08 Thread Peter Bunclark
On Sat, 7 Jan 2006, Poul-Henning Kamp wrote: What Astronomers use UTC for, in your own many times repeated words, is a convenient approximation of UT1, and consequently it follows that if instead of an approximation astronomers used the Real Thing, leap seconds could harmlessly be removed

Re: interoperability

2006-01-08 Thread Peter Bunclark
On Sun, 8 Jan 2006, Tom Van Baak wrote: between astronomical and atomic timescales. Could we rephrase that between geophysical and atomic timescales ? Astronomers measure it and have to compensate for it, not cause it. Reminds me bitterly of the widely reported loss of Mars Climate Orbiter

Re: The opportunity of leap seconds

2006-01-09 Thread Peter Bunclark
On Sun, 8 Jan 2006, Tom Van Baak wrote: Peter, So where do these modern telescope get UT1? Do you or The last time I was involved personally was during my time as a support astronomer at the Isaac Newton Group on La Palma in the early nineties. We had a radio receiver which required upcoming

Re: MJD and leap seconds

2006-01-10 Thread Peter Bunclark
On Tue, 10 Jan 2006, Tom Van Baak wrote: have no leap seconds. Astronomers appear to avoid using MJD altogether. Good grief. MJD is used widely in astronomy, for example in variablility studies where you want a real number to represent time rather than deal with the complications of parsing a

Re: MJD and leap seconds

2006-01-10 Thread Peter Bunclark
On Tue, 10 Jan 2006, Poul-Henning Kamp wrote: In message [EMAIL PROTECTED], Peter Bunclark writes: On Tue, 10 Jan 2006, Tom Van Baak wrote: have no leap seconds. Astronomers appear to avoid using MJD altogether. Good grief. MJD is used widely in astronomy, for example in variablility

Re: The real problem with leap seconds

2006-01-10 Thread Peter Bunclark
On Mon, 9 Jan 2006, Tim Shepard wrote: wot, no attribution of quotes? and you still cannot even get it [TAI] reliably from your I still think NTP should have distribute TAI, but I understand using Was your failure to form a past-participle a Freudian slip? I'm with you if you really mean NTP

Re: NOT A cruel fraud!

2006-01-22 Thread Peter Bunclark
On Sun, 22 Jan 2006, M. Warner Losh wrote: The short answer is that you cannot get a time feed of TAI, so the So isn't this one of the things we want to fix in the brave new world of joined-up timekeeping? Distribute (very close to) TAI, keep the kernel PLLs sweet, move leap second handling to

Re: the tail wags the dog

2006-01-23 Thread Peter Bunclark
On Mon, 23 Jan 2006, John Cowan wrote: Rob Seaman scripsit: that it can be reliably recovered from observations whenever and wherever needed (once you are located with respect to a meridian, of course). I don't understand this. You can't shoot the mean sun with a sextant, only the

Re: building consensus

2006-06-02 Thread Peter Bunclark
On Fri, 2 Jun 2006 [EMAIL PROTECTED] wrote: We intentionally try to be silent in this forum. Why? Peter.

Re: building consensus

2006-06-08 Thread Peter Bunclark
On Thu, 8 Jun 2006, Rob Seaman wrote: Clive D.W. Feather wrote: March was the first month of the year; look at the derivation of September, for example. Makes the zero vs. one indexing question of C and FORTRAN programmers look sane. I've pointed people to the whole 7, 8, 9, 10 sequence

Re: building consensus

2006-06-08 Thread Peter Bunclark
On Thu, 8 Jun 2006, Rob Seaman wrote: I thought Julius renamed some high value summer month and wanna-be Augustus did likewise, stealing a day from February to make August the same length. If they put two extra months in, where were those 62 days originally? Yes of course, and a quick

Re: leap seconds in art

2006-06-24 Thread Peter Bunclark
On Fri, 23 Jun 2006, Joe Fitzgerald wrote: Steve Allen wrote: Artist Felicity Hickson created a documentary of 23 people speaking for 23 seconds each. Did any of them start talking at 23:59:37 31 December 2005 UTC? If so, how long did they end up talking? The duration was timed in SI

Re: what time is it, legally?

2006-12-13 Thread Peter Bunclark
On Wed, 13 Dec 2006, Ed Davies wrote: Rob Seaman wrote: I'm given to wonder how much of the friction on this mailing list is simply due to the shortcomings in the technology that implements it. I've appended a message I sent in August with four plots attached. Can someone tell me

Re: Introduction of long term scheduling

2007-01-03 Thread Peter Bunclark
On Tue, 2 Jan 2007, Rob Seaman wrote: Daniel R. Tobias replies to Poul-Henning Kamp: Has anybody calculated how much energy is required to change the Earths rotation fast enough to make this rule relevant ? Superman could do it. Or perhaps he could nudge the Earth's rotation just

Re: Introduction of long term scheduling

2007-01-03 Thread Peter Bunclark
On Wed, 3 Jan 2007, Poul-Henning Kamp wrote: Hang on a minute, statistically planets in the Solar System do not have a large moon and yet are upright; for example Mars comes very close to the conditions required to generate a leapseconds email exploder. As far as I know the atmosphere is far

Re: how to reset a clock

2007-01-04 Thread Peter Bunclark
On Thu, 4 Jan 2007, Tony Finch wrote: On Thu, 4 Jan 2007, Zefram wrote: The solution is to just let the clock run, never adjust it, and treat it as an independent seconds count. You don't care about it showing the wrong time, because you don't treat its output as an absolute time.

NTP on Mars

2007-01-15 Thread Peter Bunclark
On Mon, 15 Jan 2007, Tony Finch wrote: On Mon, 15 Jan 2007, Peter Bunclark wrote: http://www.eecis.udel.edu/~mills/ipin.html That page does not seem to mention UTC... Look at the slides. Whoops. In my defense, there has been traffic elsewhere pointing out that authoring in powerpoint