Re: [LEAPSECS] leapseconds, converting between GPS time (week, second) and UTC

2019-01-16 Thread jimlux
On 1/16/19 12:31 AM, Poul-Henning Kamp wrote: In message <20190115205243.gb25...@ucolick.org>, Steve Allen writes: On Tue 2019-01-15T12:34:11-0800 Gary E. Miller hath writ: Yes, and no. time_t is just seconds since an epoch. Which epoch is not well defined. The epoch may well be

Re: [LEAPSECS] leapseconds, converting between GPS time (week, second) and UTC

2019-01-15 Thread jimlux
On 1/15/19 11:41 AM, Rob Seaman wrote: Isn't this covered (for instance) in section 20.3.3.5.2.4(b) of IS-GPS-200J (https://www.gps.gov/technical/icwg/IS-GPS-200J.pdf)? The various libraries and operating systems listed deal with none of the reference time scales (GPS, UTC, or TAI, for that

Re: [LEAPSECS] leapseconds, converting between GPS time (week, second) and UTC

2019-01-15 Thread jimlux
On 1/15/19 6:34 PM, Rob Seaman wrote: Hi Jim, The use case is this - I have a satellite in orbit which does everything internally in terms of GPS week and millisecond of week. Folks on the ground work in UTC, since that's what the plethora of PCs are using. Just to verify. The satellite does

Re: [LEAPSECS] Running on TAI

2019-01-15 Thread jimlux
On 1/15/19 4:19 PM, Hal Murray wrote: The trick is to find a source that will set a POSIX system to TAI, and then to avoid the gotchas that happen when such a system interacts with other POSIX systems. What do the systems that point telescopes use for maintaining their system clock? Do they

Re: [LEAPSECS] Executive Order on Strengthening National Resilience through Responsible Use of Positioning, Navigation, and Timing Services

2020-02-13 Thread jimlux
On 2/13/20 5:46 AM, Richard Langley wrote: "(i) Within 180 days of the date of this order, the Secretary of Commerce shall make available a GNSS-independent source of Coordinated Universal Time, to support the needs of critical infrastructure owners and operators, for the public and private

Re: [LEAPSECS] Executive Order on Strengthening National Resilience through Responsible Use of Positioning, Navigation, and Timing Services

2020-02-13 Thread jimlux
On 2/13/20 6:47 AM, Seaman, Robert Lewis - (rseaman) wrote: Conceivably Ruth Belville might satisfy the language: https://en.wikipedia.org/wiki/Ruth_Belville#/media/File:Ruth_Belville_1908.jpg Assuming Ms. Belville (or her successors) set their watches appropriately, yes. And it would be a

Re: [LEAPSECS] copy of UK report on public consultation?

2020-04-27 Thread jimlux
On 4/27/20 4:58 AM, BASTIAN Michelle wrote: Hi all, I’m wondering if anyone has a copy of the report from the UK public dialogue on leap seconds that happened in 2014/2015 or so? The government website has a broken link unfortunately..

Re: [LEAPSECS] LOD reaches 0 s/d

2020-11-12 Thread jimlux
On 11/12/20 3:45 PM, Poul-Henning Kamp wrote:     predicts that d(UT2)/d(TAI) = 1 after 2021-11-13, ie     the rates of UTT2 and TAI are expected to agree for the     next year. This has never happened since 1961. We may     not need to abolish leap seconds for quite a while.

Re: [LEAPSECS] article for Metrologia

2022-10-28 Thread jimlux
On 10/28/22 11:10 AM, Steffen Nurpmeso wrote: Steve Allen wrote in <20221028045813.ga20...@ucolick.org>: |On Thu 2022-10-27T19:25:01-0700 Steve Allen hath writ: |> Levine, Tavella, and Milton have an upcoming article for Metrologia |> on the issue of leap seconds in UTC |> |>

Re: [LEAPSECS] leap minute or hour

2022-11-15 Thread jimlux
On 11/15/22 1:34 PM, Poul-Henning Kamp wrote: Demetrios Matsakis via LEAPSECS writes: Another one, about traffic accidents, showed a whole bunch of wiggles = over a year, and said that one of those coincided with a DST switch. That one is actually pretty well documented in Europe,

Re: [LEAPSECS] speeding up again?

2023-06-17 Thread jimlux
On 6/15/23 10:50 PM, Poul-Henning Kamp wrote: Tom Van Baak writes: Steve, > We can probably put a lot of the blame onto El Niño That sounds plausible but I'm suspicious of quick and simple explanations. I dont think the primary El Niño phenomena involves enough mass transport to