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 e
On Fri, 12 Jan 2007, Tony Finch wrote:
> According to the slides linked from Dave Mills's "Timekeeping in the
> Interplanetary Internet" page, they are planning to sync Mars time to UTC.
> http://www.eecis.udel.edu/~mills/ipin.html
>
That page does not seem to mention UTC... it does mention runnin
On Mon, 8 Jan 2007, Zefram wrote:
>
> Conciseness is useful for network protocols. Bandwidth is increasingly
> the limiting factor: CPU speed and bulk storage sizes have been
> increasing faster. An NTPv3 packet is only 48 octets of UDP payload;
> if a leap second table is to be disseminated in t
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.
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 atmosph
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
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 m
NASA wants Discovery back on the ground by December 31 because of concerns
that shuttle computers aren't designed to make the change from the 365th
day of the old year to the first day of the new year while in flight.
"We've just never had the computers up and going when we've transitioned
from on
I rather like this, it's a quote from the most recent Cassini fly-by of
Titan; another example of the ingrained assumption that "local time" is
equivalent to rotation angle (because illumination incidence is important
to these guys).
MAPS: In general the flybys around T20 are relatively similar.
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 i
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
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, 1
More entries for the FAQ:
Q: How complicated is timekeeping?
A: Very
Q: How long has it taken us to arrive at today's timekeeping standards?
A: Ages
Q: How wide are the legal implications of changing timekeeping?
A: Pretty wide
Q: Which do the Irish prefer, paying tax or the English?
A: [oh
On Fri, 2 Jun 2006 [EMAIL PROTECTED] wrote:
>
> We intentionally try to be silent in this forum.
Why?
Peter.
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
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 t
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
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. MJ
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
On Tue, 10 Jan 2006, Mark Calabretta wrote:
> On Mon 2006/01/09 10:38:54 -0000, Peter Bunclark wrote
> in a message to: LEAPSECS@ROM.USNO.NAVY.MIL
>
> >I't be interesting to do an FFT on this list, and see if some of the
> >contributers actually ever sleep, or do any o
On Mon, 9 Jan 2006, Poul-Henning Kamp wrote:
>
> I don't think anybody dare even think about redefining POSIX time_t
I wish people would stop making positive assertions about what other
people are bound to think. What you mean in is, YOU are against
suggesting changing (or augmenting) POSIX time.
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 upcomin
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
On Sun, 8 Jan 2006, Poul-Henning Kamp wrote:
> finger [EMAIL PROTECTED]
You mean [EMAIL PROTECTED] That would be quiet useful. Otherwise let's not
bother with NTP protocol, just [EMAIL PROTECTED]
Pete.
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 remov
Pete.
On Tue, 3 Jan 2006, Randy Kaelber wrote:
> On Tue, Jan 03, 2006 at 07:42:31AM +0000, 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
And these "Rocket Scientists" can't even spell. Perhaps they can't read,
either. Surely 5 decades into the space age there exists a "How to build a
Spacecraft" text book with a chapter on timescales?
Pete.
On Mon, 2 Jan 2006, Greg Hennessy wrote:
> Textbook example of using the right tool for th
On Wed, 21 Dec 2005, Poul-Henning Kamp wrote:
>
> I think the difference between you and me as a programmer is that
> if you make a mistake, some radio telescope bungles up an observation
> or worst case runs against a mechanical end-stop.
Or kills somebody. A telescope is as dangerous as any othe
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 w
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 TT&M Division <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject:
=?iso-8859-1?B?TGVhcCBTZWNvbmQgJiBTeW1
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 Tim
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
On Mon, 26 Sep 2005, Poul-Henning Kamp wrote:
>
> On the other hand, even if we agree on one standard, or even just
> leave UTC as it is, are the astronomers and geophysiscists going
> to abandon UT1 ?
>
> If so, then this is the first I've heard about it.
Of course not.
>
> Imagine for instance t
On Tue, 30 Aug 2005, Poul-Henning Kamp wrote:
> In message <[EMAIL PROTECTED]>, Peter Bunclark writes:
>
> >I would have thought that part of the answer to the difficulty in
> >implementation and testing would be to use an open-source library of tried
> >and tes
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, writi
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, nowa
Non-clash between FITS BoF and LeapSecs BoF has got to be a condition of
the program.
Peter.
On Thu, 11 Aug 2005, Mark Calabretta wrote:
> On Tue 2005/08/09 16:01:01 MST, Rob Seaman wrote
> in a message to: LEAPSECS@ROM.USNO.NAVY.MIL
>
> Rob,
>
> >at a BoF (inevitably scheduled opposite the FITS
I quote this out of interest more than an argument, from
http://marsrovers.jpl.nasa.gov/mission/status.html
"The team has been watching Opportunity's power very carefully. It seems
that Opportunity is losing some of the power boost it received during the
last cleaning event. The solar array wake u
On Thu, 4 Aug 2005, Steve Allen wrote:
> program start and stop time to within a minute. Thursday night
> viewers are well aware that CBS always runs CSI right up to, or
> sometimes past 22:00 while NBC starts ER as much as two minutes before
> 22:00.
But that's not bad timekeeping, it is an exam
I guess the ice melted, flowed into the oceans and the whole planet is
closer to hydrostatic equilibrium. The crustal rebound must have a
counterpart in ocean-basin depressing (since presumably magma is an
uncompressible liquid).
Pete.
On Thu, 27 Jan 2005, Clive D.W. Feather wrote:
> Markus Kuhn
On Tue, 19 Aug 2003, John Cowan wrote:
> James Johnson scripsit:
>
> > However I have pondered over this situation for some time, and would offer
> > this humble suggestion. As scientist we trained there are no coincidences, that
> > there are facts to substantiate happenings.
>
> Consider the an
On Tue, 22 Jul 2003, Clive D.W. Feather wrote:
> Steve Allen said:
> > CNN is broadcasting the video form of this story today
> >
> > http://www.cnn.com/2003/WORLD/europe/07/22/time.boulden/index.html
> >
> > I surmise that Mr. Catchpole was not prepared with the figures.
>
> He also seems to be u
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 digi
On Thu, 26 Jun 2003, Steve Allen wrote:
> (with apologies to the BBC, John Nathan Turner, Tom Baker, Peter
> Davison, &c. for this note's subject: line)
>
> On Thu 2003-06-26T12:13:49 +0100, Ed Davies hath writ:
> > > The Guardian
> > > http://www.guardian.co.uk/uk_news/story/0,3604,985020,00.htm
On Fri, 6 Jun 2003, Kevin J. Rowett wrote:
> Many wills and living trusts these days are written to provide
> for concurrent death events of both spouses, even to the point of
> defining concurrent to be within 30 hours of each other.
>
> KR
So move the deaths exactly (exactly?!!!) 30 hours apart
>
> 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
On Wed, 4 Jun 2003, William Thompson wrote:
> Markus Kuhn wrote:
>
> (stuff deleted)
>
> > While the international inch is indeed linked to the meter by a
> > reasonably round factor, and even shows up indirectly in a number of ISO
> > standards (e.g., inch-based threads and pipes), this c
On Mon, 27 Jan 2003, John Cowan wrote:
>
> Then split off UTT (or what have you), which keeps the old UTC definition,
> and let civil time (outside the U.K. at least) conform to the new UTC
> definition.
I like the idea of the UK being the only place with accurate clocks.
>
> Astronomers probably
On Mon, 27 Jan 2003, Markus Kuhn wrote:
>
> - The Royal Greenwich Observatory would loose its distinguished
> role as being a point whose locale time is of any particular
> significance
>
The Royal Greewich Observatory moved from Herstmonceux to Cambridge in
1989. It was closed in 1998.
49 matches
Mail list logo
