[LEAPSECS] Back to Basics

2010-11-03 Thread Finkleman, Dave
Recalibrating to get to the point. 1. Universal Time is a set of time scales related to the mean diurnal motion of the Sun.So defined in many places and first recommended by the IAU in 1935. Different flavors have been defined and redefined since, but the connection with motion of the Sun is

Re: [LEAPSECS] Back to Basics

2010-11-03 Thread Steve Allen
On Wed 2010-11-03T12:39:30 -0400, Finkleman, Dave hath writ: > Anything "Universal" by definition must be related to the mean motion of > the Sun. This usage dates from the 1884 International Meridian Conference at which the terms "cosmic" and "universal" were applied, depending on the translation

Re: [LEAPSECS] Back to Basics

2010-11-03 Thread Ian Batten
On 03 Nov 10, at 1639, Finkleman, Dave wrote: > ITU-R 460-x are not > normative international standards. A normative standard can be > referenced in contracts as a binding requirement. I'm not quite sure what point you're making there. I can reference any document as a binding requirement in

Re: [LEAPSECS] Back to Basics

2010-11-03 Thread Rob Seaman
Well stated. I'm not sure about the intended meaning of the final sentence beginning "We require guidance" and ending "element of that spectrum". Rob -- On Nov 3, 2010, at 9:39 AM, Finkleman, Dave wrote: > Recalibrating to get to the point. > > 1. Universal Time is a set of time scales relat

Re: [LEAPSECS] Back to Basics

2010-11-03 Thread Poul-Henning Kamp
In message <3b33e89c51d2de44be2f0c757c656c88099aa...@mail02.stk.com>, "Finklema n, Dave" writes: >3. The ITU is constituted under the UN as a regulatory agency without >the force of law. Check the fine print... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org |

Re: [LEAPSECS] Back to Basics

2010-11-03 Thread ashtongj
Getting back to basics is good, but my view is different from Mr. Finkleman's. The world of measurements is effectively divided into the realms of discussion, publication, and research, versus the realm of commerce. In the first realm, you can do whatever you want (if you live in a place wher

Re: [LEAPSECS] Back to Basics

2010-11-03 Thread Steve Allen
On Wed 2010-11-03T13:46:02 -0400, ashtongj hath writ: > But I could write a contract specifying UTC and I strongly suspect > it would be enforced. In that case all POSIX systems are illegal and would be subject to confiscation or shutdown. Just yesterday we showed that there is no single, consist

Re: [LEAPSECS] Back to Basics

2010-11-03 Thread Tony Finch
On Wed, 3 Nov 2010, ashtongj wrote: > > The law in the US sets up time zones based on UTC, and contains the following: > > Coordinated Universal Time Defined.--In this section, the > term `Coordinated Universal Time' means the time scale maintained > through the General Conference of Weights

Re: [LEAPSECS] Back to Basics

2010-11-03 Thread Steve Allen
On Wed 2010-11-03T18:22:16 +, Tony Finch hath writ: > That is very strange wording, given that UTC is specified by the ITU-R but > only endorsed by the CGPM. Is it that the BIPM has a lot of operational > responsibility for UTC, and they are an agency under the authority of the > CGPM? Remembe

Re: [LEAPSECS] Back to Basics

2010-11-03 Thread Michael Sokolov
ashtongj wrote: > If I point a gun at the police when they show > up to assist the inspectors, the police will kill me. And what if your army is stronger than the police and you kill them, not the other way around? I have heard that the average ratio in USA is approximately 1000 citizens per p

Re: [LEAPSECS] Back to Basics

2010-11-03 Thread Warner Losh
On 11/03/2010 12:25, Steve Allen wrote: On Wed 2010-11-03T18:22:16 +, Tony Finch hath writ: That is very strange wording, given that UTC is specified by the ITU-R but only endorsed by the CGPM. Is it that the BIPM has a lot of operational responsibility for UTC, and they are an agency under

Re: [LEAPSECS] Back to Basics

2010-11-03 Thread Ian Batten
On 3 Nov 2010, at 17:59, Steve Allen wrote: > On Wed 2010-11-03T13:46:02 -0400, ashtongj hath writ: >> But I could write a contract specifying UTC and I strongly suspect >> it would be enforced. > > In that case all POSIX systems are illegal and would be > subject to confiscation or shutdown. A

Re: [LEAPSECS] Back to Basics

2010-11-03 Thread Michael Deckers
On 2010-11-03 18:25, Steve Allen wrote: Remember that the standing CGPM resolution says that UTC is mean solar time. http://www1.bipm.org/jsp/en/ViewCGPMResolution.jsp?CGPM=15&RES=5 No. It says "approximation to .. mean solar time". That this is meant is grammatically unambiguous

Re: [LEAPSECS] Back to Basics

2010-11-04 Thread Jonathan E. Hardis
On Nov 3, 2010, at 6:53 PM, Ian Batten wrote: ...otherwise UTC(GPS) is fine... There is no such thing as UTC(GPS). The GPS signal provides the offset that allows the receiver to compute UTC(USNO). It can also be used to disseminate UTC estimates of other national laboratories, but they