Hi Tom and Mike and all,
I suppose we weren’t talking about DUT1 time signals?
See http://futureofutc.org/2011/program/presentations/AAS_11-675_Malys.pptx.pdf
for details about the flipside question of operating a GNSS constellation
(current as of a dozen years ago).
One shouldn’t find it
Happy Holidays,
I started to reply to recent emails, but all issues except one have been
discussed over and over again on the mailing list and at the various workshops.
So, my Christmas gift to you all is not to reply, and to myself was to dust off
the login and server info for the
E pur si muove
UTC may no longer serve as a kind of solar time (after 2026 or 2035, or
somebody said 2040 the other day), but civil time will continue to have
engineering requirements tracing to both solar and atomic time scales.
Shenanigans will result, bedeviling future blinkered
The Babylonians would perhaps aver this is not the best possible title: “Why
the day is 24 hours long: The history of Earth’s atmospheric thermal tide,
composition, and mean temperature”. In any event, there are lots of resonances
and near-resonances in the solar system. If any dynamicists are
This point of view (from Richard’s second citation) is rather backward: “LOD is
the negative time-derivative of UT1-UTC”, whatever its mathematical utility.
And whatever one’s philosophical position on the topic of this list.
I’m a little at a loss for what we’re discussing here. The
Isn’t the question whether those responsible for issuing leap seconds will
follow through and trigger a negative leap second even if Bulletin A says it’s
time? Much consternation will be feigned.
Rob Seaman
Lunar and Planetary Laboratory
University of Arizona
On 3/19/23, 5:21 PM, "LEAPSECS"
workout as
this foundational standard is redefined.
Rob
On 11/21/22, 8:30 AM, "LEAPSECS" wrote:
On 2022-11-21 14:19, Seaman, Robert Lewis - (rseaman) wrote:
> In a post-leap-second world, precision values for dUT1 either become more
> critical or less. Or rather, they become n
Interesting. In a post-leap-second world, precision values for dUT1 either
become more critical or less. Or rather, they become no-less important
scientifically but perhaps negligible politically. For example,
https://www.sciencedirect.com/science/article/pii/S0273117719302388 says
“Global
systems do care at the level of the current UTC
approximation. Some care at much higher precision. So, what alternative
standards and infrastructure will be available in the future?
Time to move on…
Rob
On 11/20/22, 10:31 AM, "LEAPSECS" wrote:
External Email
Seaman, Robert Lewis
anybody else has yet found the mark themselves.
Rob
Seaman, Robert Lewis - (rseaman) wrote:
> The plan, rather, is to cease easy access to solar time.
The resolution says the GCPM
: encourages the BIPM to work with relevant organizations to identify the
: need for updates in the differ
Whatever they do to poor old UTC and by extension to the concept of Universal
Time as the modern realization of Greenwich Mean Time, atomic time and solar
time will continue to be separate kinds of time scales, both of which are
necessary for diverse engineering requirements for civil
., Canada E3B 5A3
|
|Fredericton? Where's that? See: http://www.fredericton.ca/
|
-
> On Feb 13, 2020, at 10:14 AM, Seaman, Robert Lewis - (rseaman)
wrote:
Hi Richard,
Interesting! A few immediate comments / questions:
1) Political talk to /dev/null
2) Whether as executive order or otherwise, language like this obviously
originated with experts.
3) Does anybody know what agenc(ies) appears to be motivating this?
4) Are commercial interests
Hello all,
The fundamental answer / constraint to all questions of engineering, including
temporal engineering, is funding. No bucks, no Buck Rogers. “Time” is a vast
topic, pretty much as big as “space”. Precision timekeeping topics are only
somewhat smaller in practical terms since issues of
Tried to send this a few days ago, but it never showed up on the list. Steve
has provided gritty details since.
Since roughly the second world war, the distinction between time-of-day and
interval-time has become increasingly clear. But the history of this
distinction goes back at least as far
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