The Astronomical Almanac (2019) says
∆UT = UT1 - UTC
DUT1 = predicted value of ∆UT, rounded to 0.1 s, given in some radio
time signals
(Unfortunately, this scan cuts off part of the leftmost characters. But
you can deduce them, except perhaps Ee and Eo: equation of the equinoxes
and
Interesting!
Another example of “polysemy”
(http://hanksville.org/futureofutc/aas223/presentations/2-1-ISOterminologyAAS.pdf)
in timekeeping.
In addition to changes in funding (be careful what you ask for, precision time
community), best practices (and worse practices) should get a good
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 no-less important scientifically but
perhaps negligible politically. For
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
On 2022-11-20 15:15, Tony Finch asked:
(Do any of
the national broadcast signals actually follow the ITU spec?)
Lists of UTC time signals with details about the coding are in
the Annual reports of the BIPM time department, at
[https://www.bipm.org/en/time-ftp/annual-reports].
Tony Finch said:
> Well, no, not for more than half the year. I happen to be close to the
> Greenwich meridian so my clocks currently show something close to mean
> solar time (about 30 seconds fast, I think?) but that isn't true for most
> people.
Indeed.
I live 1 minute 37 seconds east of the
Hi Tony,
The time zone system and daylight-saving time are layered on UTC. My clock
shows Mountain Standard Time year-round. Other people’s show other local times
and 10-15% of these change by an hour twice a year. These small complications
will not be made simpler by attempting to remove the
Seaman, Robert Lewis - (rseaman) wrote:
>
> Getting the solar time currently means looking at your watch or the
> upper right-hand corner of the monitor.
Well, no, not for more than half the year. I happen to be close to the
Greenwich meridian so my clocks currently show something close to mean
ssion List
Subject: Re: [LEAPSECS] future access to solar time?
Hi Tony,
Getting the solar time currently means looking at your watch or the upper
right-hand corner of the monitor. Would anybody else's summary of the notion of
"easy access" include phrases like: "8.23 bits two
Hi Tony,
Getting the solar time currently means looking at your watch or the upper
right-hand corner of the monitor. Would anybody else’s summary of the notion of
“easy access” include phrases like: “8.23 bits two’s complement fixed point” or
“NMEA sentences that contain anything like UT1 or
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 different services that disseminate the value of
: the difference
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
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