Re: [LEAPSECS] LEAPSECS Digest, Vol 50, Issue 30
On Sat, 29 Jan 2011, Finkleman, Dave wrote: Ken, John Seago, and I delivered a paper to the AAS last August that includes many of the thoughts in this thread. Is a copy of the paper available online? Tony. -- f.anthony.n.finch d...@dotat.at http://dotat.at/ HUMBER THAMES DOVER WIGHT PORTLAND: NORTH BACKING WEST OR NORTHWEST, 5 TO 7, DECREASING 4 OR 5, OCCASIONALLY 6 LATER IN HUMBER AND THAMES. MODERATE OR ROUGH. RAIN THEN FAIR. GOOD. ___ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
Re: [LEAPSECS] LEAPSECS Digest, Vol 50, Issue 30
On Mon 2011-01-31T17:21:48 +, Tony Finch hath writ: On Sat, 29 Jan 2011, Finkleman, Dave wrote: Ken, John Seago, and I delivered a paper to the AAS last August that includes many of the thoughts in this thread. Is a copy of the paper available online? http://www.agi.com/downloads/resources/user-resources/downloads/whitepapers/DebateOverUTCandLeapSeconds.pdf -- Steve Allen s...@ucolick.orgWGS-84 (GPS) UCO/Lick ObservatoryNatural Sciences II, Room 165Lat +36.99855 University of CaliforniaVoice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064http://www.ucolick.org/~sla/ Hgt +250 m ___ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
Re: [LEAPSECS] LEAPSECS Digest, Vol 50, Issue 30
On Mon, 31 Jan 2011, Steve Allen wrote: http://www.agi.com/downloads/resources/user-resources/downloads/whitepapers/DebateOverUTCandLeapSeconds.pdf Thanks! Tony. -- f.anthony.n.finch d...@dotat.at http://dotat.at/ HUMBER THAMES DOVER WIGHT PORTLAND: NORTH BACKING WEST OR NORTHWEST, 5 TO 7, DECREASING 4 OR 5, OCCASIONALLY 6 LATER IN HUMBER AND THAMES. MODERATE OR ROUGH. RAIN THEN FAIR. GOOD. ___ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
Re: [LEAPSECS] LEAPSECS Digest, Vol 50, Issue 30
Steve, See also Time Scales by Louis Essen for a whole set of interesting historical nuggets on the origin of UTC: http://www.leapsecond.com/history/1968-Metrologia-v4-n4-Essen.pdf I would like to suggest that the rest of you read this as well. In case you didn't already know, it was Essen that made the first caesium clock. He was also the atomic time half of the 3 year experiment to measure and later define the SI second as 9 192 631 770 cycles... It's only a couple of pages long and while it's 30+ years old it highlights exactly the time scales issues being discussed here this week; the co-ordination of atomic clocks in labs around the world; the co-ordination of that atomic time scale with astronomical time scales; and the distribution of that time frequency to the user. I like it for another reason -- it's the earliest paper I've found where leap seconds are mentioned; well not quite by that name -- instead it's moving the minute marker along by 1 sec on a prearranged date, possibly 1 January and 1 June What's interesting is that the metaphor is simply an analog clock (even precise timing equipment from that era was not digital). So in this paper at least the problems of :59:60 did not arise. /tvb ___ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
Re: [LEAPSECS] LEAPSECS Digest, Vol 50, Issue 30
On 2011 Jan 29, at 09:39, Finkleman, Dave wrote: In particular, we suggest that the ITU should not own UTC. The adjective co-ordinated in conjunction with Universal Time occurs in the proceedings of the IAU general assembly of 1961. The books by Audoin Guinot and by McCarthy Seidelmann both indicate that the system of co-ordination had been agreed upon by the US and UK during 1959 and was operational by 1960. Anna Stoyko retired and as of 1964-01 Bernard Guinot was publishing the BIH circulars. It was in the first edition under Guinot that the adjective co-ordinated first appears as an acronym T.U.C Nevertheless the resolutions of the IAU general assembly from 1964 contain only the adjective co-ordinated and the acronyms U.T.2 and T.U.2 with the recommendations begin that radio broadcasts provide UT2. Similarly the CCIR recommendation which preceded TF.460 only ever mentioned UT2. The term UTC does not occur in any CCIR recommendation until 1970. McCarthy and Seidelmann indicate that the IAU approved of the name Coordinated Universal Time with abbreviation UTC during 1965, but they provide no citation to an original source for that fact. Audoin and Guinot do not claim credit for coining UTC saying that it was spontaneously christened, but clearly it originated in discussions between BIH and the time service bureaus of UK and USNO. I would like to think that the CCIR (now ITU-R) took stewardship of the name UTC from the agencies who studied earth rotation and thus measured Universal Time, and that if the broadcasts cease to be related to rotation then they should relinquish the stewardship. I had better stop before someone accuses me of imitating Tolkien's Silmarillion and making that last sentence as an allegory of The Return of the King. -- Steve Allen s...@ucolick.org WGS-84 (GPS) UCO/Lick Observatory Natural Sciences II, Room 165 Lat +36.99855 University of California Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m ___ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
