Re: [LEAPSECS] CEPT ECC viewpoint on leap seconds

2015-01-28 Thread Brooks Harris
It says - Until now the solution has been to introduce a 'leap second', in other words to stop 'official/scientific' time (Co-ordinated Universal Time, 'UTC'), for one second every so often. Hold the phone. to stop 'official/scientific' time?!? How worrisome is it that the chair of the

Re: [LEAPSECS] The leap second, deep space and how we keep time -Brooks

2015-01-28 Thread Poul-Henning Kamp
Martin, Ideally, all software should be flawless and bugfree. This lofty goal would come at a cost, I don't think I need to convince you that it would be a very high cost, for civilization as such. We can argue if it would be worth the investment. I personally think it could be, but

Re: [LEAPSECS] The leap second, deep space and how we keep time -Brooks

2015-01-28 Thread Martin Burnicki
Warner Losh schrieb: On Jan 27, 2015, at 7:18 PM, Steve Allen s...@ucolick.org wrote: On Tue 2015-01-27T21:41:17 +, Matsakis, Demetrios hath writ: Equally unfortunate is that 30 servers in the NTP pool inserted a leap second last Dec 31. There is no action that the ITU-R can take which

Re: [LEAPSECS] CEPT ECC viewpoint on leap seconds

2015-01-28 Thread mike
Le 28.01.2015 11:09, Poul-Henning Kamp a écrit : In message 54c8b26d.6050...@edlmax.com, Brooks Harris writes: It says - Until now the solution has been to introduce a 'leap second', in other words to stop 'official/scientific' time (Co-ordinated Universal Time, 'UTC'), for

Re: [LEAPSECS] The leap second, deep space and how we keep time -Brooks

2015-01-28 Thread Poul-Henning Kamp
In message 20150128021831.ga31...@ucolick.org, Steve Allen writes: On Tue 2015-01-27T21:41:17 +, Matsakis, Demetrios hath writ: Equally unfortunate is that 30 servers in the NTP pool inserted a leap second last Dec 31. There is no action that the ITU-R can take which will change

Re: [LEAPSECS] The leap second, deep space and how we keep time -Brooks

2015-01-28 Thread mike
Le 28.01.2015 10:07, Poul-Henning Kamp a écrit : In message 20150128021831.ga31...@ucolick.org, Steve Allen writes: On Tue 2015-01-27T21:41:17 +, Matsakis, Demetrios hath writ: Equally unfortunate is that 30 servers in the NTP pool inserted a leap second last Dec 31. There

Re: [LEAPSECS] CEPT ECC viewpoint on leap seconds

2015-01-28 Thread Poul-Henning Kamp
In message 54c8b26d.6050...@edlmax.com, Brooks Harris writes: It says - Until now the solution has been to introduce a 'leap second', in other words to stop 'official/scientific' time (Co-ordinated Universal Time, 'UTC'), for one second every so often. Hold the phone. to stop

[LEAPSECS] leap second and DUT1 database

2015-01-28 Thread Tom Van Baak
Hi Warner, Keeping cold spares is a good example. I can see that having to acquire GPS lock and waiting up to 12.5 minutes for current leap second information would be a problem. There must be a way to cache that state so rapid failover is possible, in both the hot and cold spare case. I know

Re: [LEAPSECS] CEPT ECC viewpoint on leap seconds

2015-01-28 Thread Brooks Harris
Point taken. Sorry. They probably do understand it, and just made a careless statement. But too many folks don't get it. I think its because the specs are not clear in the first place and the misunderstandings have been piling up in mismatched applications for years. Somebody somewhere needs

Re: [LEAPSECS] leap second and DUT1 database

2015-01-28 Thread Poul-Henning Kamp
In message D23088365D3E46A3B6C04B915AFB6920@pc52, Tom Van Baak writes: Keeping cold spares is a good example. I can see that having to acquire GPS lock and waiting up to 12.5 minutes for current leap second information would be a problem. There must be a way to cache that state so

Re: [LEAPSECS] CEPT ECC viewpoint on leap seconds

2015-01-28 Thread mike
Looks like there is still work in progress even this close to the WRC. ECC seems to be recommending what I consider to be the least bad option on the table, but I am not sure that the individual European governments, who in the end are those that vote, are all in the same boat. IIRC France was

Re: [LEAPSECS] CEPT ECC viewpoint on leap seconds

2015-01-28 Thread mike
Oops - that last one got away while I was trying to quit HTML!!! Le 28.01.2015 11:09, Poul-Henning Kamp a écrit : In message 54c8b26d.6050...@edlmax.com, Brooks Harris writes: It says - Until now the solution has been to introduce a 'leap second', in other words to stop

Re: [LEAPSECS] CEPT ECC viewpoint on leap seconds

2015-01-28 Thread Brooks Harris
On 2015-01-28 05:49 AM, Brooks Harris wrote: On 2015-01-28 05:31 AM, m...@lumieresimaginaire.com wrote: Oops - that last one got away while I was trying to quit HTML!!! Le 28.01.2015 11:09, Poul-Henning Kamp a écrit : In message 54c8b26d.6050...@edlmax.com, Brooks Harris writes:

Re: [LEAPSECS] CEPT ECC viewpoint on leap seconds

2015-01-28 Thread Brooks Harris
On 2015-01-28 05:31 AM, m...@lumieresimaginaire.com wrote: Oops - that last one got away while I was trying to quit HTML!!! Le 28.01.2015 11:09, Poul-Henning Kamp a écrit : In message 54c8b26d.6050...@edlmax.com, Brooks Harris writes: It says - Until now the solution has been to

Re: [LEAPSECS] The leap second, deep space and how we keep time -Brooks

2015-01-28 Thread Warner Losh
On Jan 28, 2015, at 2:33 AM, Martin Burnicki martin.burni...@meinberg.de wrote: Warner Losh schrieb: On Jan 27, 2015, at 7:18 PM, Steve Allen s...@ucolick.org wrote: On Tue 2015-01-27T21:41:17 +, Matsakis, Demetrios hath writ: Equally unfortunate is that 30 servers in the NTP

Re: [LEAPSECS] All of this has happened before

2015-01-28 Thread Poul-Henning Kamp
We each wear multiple hats. Two of mine are 1) to point out that physical reality trumps standards and software, [...] And one of my hats is to point out that you have no monopoly on defining physical reality and have a great tendency to define it to support your opinions. Likewise,

Re: [LEAPSECS] The leap second, deep space and how we keep time -Brooks

2015-01-28 Thread mike
Maybe we should find out if that is reasonable, or maybe just a journalistic misunderstanding. That's is a huge difference to the sources you quote. I was quite comfortable that there would be no more than a couple of adjustments required per year out at 200yrs. Unfortunately there are no

Re: [LEAPSECS] All of this has happened before

2015-01-28 Thread Rob Seaman
On Jan 28, 2015, at 10:02 AM, Poul-Henning Kamp p...@phk.freebsd.dk wrote: We each wear multiple hats. Two of mine are 1) to point out that physical reality trumps standards and software, [...] And one of my hats is to point out that you have no monopoly on defining physical reality and

Re: [LEAPSECS] The leap second, deep space and how we keep time -Brooks

2015-01-28 Thread Alex Currant via LEAPSECS
My company got burned by mis-programming for Y2K.  It's hard to test things that happen every few years. It might be a good debating point to say that in one specific incident the future ITU decision would not help, but it's a diversion.   I have trouble believing people who keep misleading and

Re: [LEAPSECS] The leap second, deep space and how we keep time -Brooks

2015-01-28 Thread Matsakis, Demetrios
Oops - I was referring to the predictions.Of course, any group of people will have disagreements about all kinds of things, and that can be healthy. But I am not aware of anyone disagreeing with me on that one point. -Original Message- From: LEAPSECS

Re: [LEAPSECS] All of this has happened before

2015-01-28 Thread Rob Seaman
On Jan 28, 2015, at 1:34 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote: Derives from is not a physical reality, it's merely a social custom. So many replies to choose from - and so many that have been posted in the past - let's go with some (unvetted) quotes on custom: - Truth always

Re: [LEAPSECS] The leap second, deep space and how we keep time -Brooks

2015-01-28 Thread Warner Losh
It would be interesting to poll the USNO staff once a year as to what they think the UT1 divergence form TAI will be in 2100. I wonder what that graph would look like :) Warner On Jan 28, 2015, at 3:03 PM, Matsakis, Demetrios demetrios.matsa...@usno.navy.mil wrote: Oops - I was referring

Re: [LEAPSECS] leap second and DUT1 database

2015-01-28 Thread Warner Losh
On Jan 28, 2015, at 5:25 AM, Tom Van Baak t...@leapsecond.com wrote: Hi Warner, Keeping cold spares is a good example. I can see that having to acquire GPS lock and waiting up to 12.5 minutes for current leap second information would be a problem. There must be a way to cache that

Re: [LEAPSECS] The leap second, deep space and how we keep time -Brooks

2015-01-28 Thread Steve Allen
On Wed 2015-01-28T15:10:09 +, Alex Currant via LEAPSECS hath writ: I have trouble believing people who keep misleading and outdated information on their web pages Following up the issue from last week about how big will the difference between Atomic Time and Universal Time get during this

[LEAPSECS] All of this has happened before

2015-01-28 Thread Rob Seaman
We each wear multiple hats. Two of mine are 1) to point out that physical reality trumps standards and software, and that 2) that there are precious few conversations here that haven’t occurred before: - Warner has explained his use case in the past. There are likely no engineering use

Re: [LEAPSECS] The leap second, deep space and how we keep time -Brooks

2015-01-28 Thread Poul-Henning Kamp
In message 20150128152743.ga12...@ucolick.org, Steve Allen writes: If there is a problem with my web pages I will be happy to debate it either publicly or discus it privately. So why don't you simply list all the estimates as we find them ? As far as I can tell, these guesses/estimates