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Groups > comp.programming > #7266
| From | antispam@math.uni.wroc.pl |
|---|---|
| Newsgroups | alt.comp.hardware.pc-homebuilt, comp.lang.c, comp.lang.ada, comp.programming, alt.comp.os.windows-10, alt.os.linux.ubuntu |
| Subject | Re: 'Leap Second' to Be Added on New Year's Eve This Year |
| Date | 2017-01-05 19:28 +0000 |
| Organization | Politechnika Wroclawska |
| Message-ID | <o4m6pr$go9$1@z-news.wcss.wroc.pl> (permalink) |
| References | <o3gl85$j26$1@dont-email.me> <op.ytcu9n0djs98qf@red.lan> <5f5afd36-1ba2-f4e2-62ef-57a652f3170c@verizon.net> |
Cross-posted to 6 groups.
In comp.lang.ada James R. Kuyper <jameskuyper@verizon.net> wrote:
> On 12/31/2016 04:57 PM, James Wilkinson Sword wrote:
> > On Thu, 22 Dec 2016 13:43:58 -0000, Mr. Man-wai Chang <toylet.toylet@gmail.com> wrote:
> ...
> >> A "leap second" will be added to the world's official clocks on Dec. 31
> >> at 23 hours, 59 minutes and 59 seconds Coordinated Universal Time (UTC),
> >> which corresponds to 6:59:59 p.m. EST; the clocks will read 23:59:60
> >> before ticking over to midnight. The goal is to keep two different
> >> timescales in sync with each other.
> >>
> >> The units of time had long been defined based on Earth's rotation
> >> relative to distant celestial bodies. But that changed with the
> >> invention of atomic clocks in the mid-20th century; scientists then
> >> decided to base the second on the natural vibrations of the cesium atom.
> >> [How to Build the Most Accurate Atomic Clocks (Video)]
> >>
> >> These two timescales don't match up exactly, however. Measurements show
> >> that, because the moon's gravitational pull and other factors are
> >> gradually slowing Earth's spin, the rotation-based scale loses between
> >> 1.5 and 2 milliseconds per day compared to atomic time ? meaning the two
> >> diverge by a full second every 500 to 750 days.
> >>
> >> Leap seconds are a way to make up for this difference. Since 1972, the
> >> International Earth Rotation and Reference Systems Service (IERS) ? the
>
> That name always struck me as rather funny - it seems to imply that
> they're responsible for making the Earth rotate. What they're actually
> responsible for is keeping track of the Earth's rotation.
>
> >> organization that keeps track of time for the world ? has added 26 leap
> >> seconds to atomic clocks, with the last such insertion coming on June
> >> 30, 2015.
> >>
> >> The aim is to keep the two timescales within 0.9 seconds of each other.
> ...
> > I wish they'd turn their attentions to not turning the clocks back and forth all the fucking time!
>
> If you could make the Earth rotate at a fixed rate, there would be no
> need for leap seconds. It's perfect feasible, though the costs would be
> astronomical. Would you care to pay enough in taxes to make that happen?
Changing _time_ is a nonsense and Earth rotation has little to
do with this:
- most of ordinary time use is conventional and shift of few minutes
will not chage much. AFAICS to accumulate 5 minutes difference
we need hundreds of years, plenty of time to update conventions
if needed. In precision use jumping time is bigger hurdle than
help: astonomers care about differences much smaller than a
second.
- if one really wants to follow Earth rotation time base still
should be continous and at most mapping from "universal" to
"local" time should change. Given that basic time unit is
second we probably should designate one specific moment as
start of rational era and simply measure time in second
relative to this moment. UTC could be reasonable approximation
to rational time, but leap seconds spoil its properties.
--
Waldek Hebisch
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'Leap Second' to Be Added on New Year's Eve This Year "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-12-22 21:43 +0800
Re: 'Leap Second' to Be Added on New Year's Eve This Year Siri Cruise <chine.bleu@yahoo.com> - 2016-12-22 05:48 -0800
Re: 'Leap Second' to Be Added on New Year's Eve This Year "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-12-22 22:09 +0800
Re: 'Leap Second' to Be Added on New Year's Eve This Year Krzysztof Mitko <invalid@kmitko.at.list.dot.pl> - 2016-12-24 13:47 +0100
Re: 'Leap Second' to Be Added on New Year's Eve This Year Siri Cruise <chine.bleu@yahoo.com> - 2016-12-24 05:39 -0800
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2016-12-22 14:31 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Storkamp <mstorkamp@yahoo.com> - 2016-12-23 08:34 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year "J-P. Rosen" <rosen@adalog.fr> - 2016-12-23 16:55 +0100
Re: 'Leap Second' to Be Added on New Year's Eve This Year Ken Brody <kenbrody@spamcop.net> - 2016-12-30 11:17 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Gene Wirchenko <genew@telus.net> - 2016-12-30 09:38 -0800
Re: 'Leap Second' to Be Added on New Year's Eve This Year hah <hah@no.email.stupid.invalid> - 2016-12-30 15:59 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2016-12-30 15:47 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Ken Blake <Ken@invalid.news.com> - 2016-12-30 15:14 -0700
Re: 'Leap Second' to Be Added on New Year's Eve This Year Kaz Kylheku <221-501-9011@kylheku.com> - 2016-12-30 23:26 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-03 20:46 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Jason <jason_warren@ieee.DELETE.org> - 2016-12-22 17:14 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year "Jonathan N. Little" <lws4art@gmail.com> - 2016-12-22 17:40 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Jason <jason_warren@ieee.org> - 2016-12-23 19:57 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Char Jackson <none@none.invalid> - 2016-12-23 21:44 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James Wilkinson Sword" <imvalid@somewear.com> - 2016-12-31 23:42 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year Ken Brody <kenbrody@spamcop.net> - 2016-12-30 11:16 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2016-12-30 15:58 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Keith Thompson <kst-u@mib.org> - 2016-12-30 14:37 -0800
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2016-12-30 19:16 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Keith Thompson <kst-u@mib.org> - 2016-12-30 17:48 -0800
Re: 'Leap Second' to Be Added on New Year's Eve This Year Jorgen Grahn <grahn+nntp@snipabacken.se> - 2016-12-31 10:08 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2016-12-31 14:20 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2016-12-31 14:34 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Wally W. <ww84wa@aim.com> - 2016-12-31 16:45 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Ken Blake <Ken@invalid.news.com> - 2016-12-31 16:34 -0700
Re: 'Leap Second' to Be Added on New Year's Eve This Year Wally W. <ww84wa@aim.com> - 2016-12-31 20:52 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Richard Heathfield <rjh@cpax.org.uk> - 2017-01-01 12:22 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2017-01-01 15:47 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Keith Thompson <kst-u@mib.org> - 2016-12-31 13:59 -0800
Re: 'Leap Second' to Be Added on New Year's Eve This Year Wally W. <ww84wa@aim.com> - 2017-01-01 13:46 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2017-01-01 16:12 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Wally W. <ww84wa@aim.com> - 2017-01-01 19:44 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Wally W. <ww84wa@aim.com> - 2017-01-01 22:31 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Ken Blake <Ken@invalid.news.com> - 2017-01-02 11:23 -0700
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2017-01-02 19:03 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Storkamp <mstorkamp@yahoo.com> - 2017-01-02 13:46 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Wolf K <wolfmac@sympatico.ca> - 2017-01-02 14:55 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Andy Burns <usenet@andyburns.uk> - 2017-01-02 20:00 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year Sam E <why.should.this@be.email.invalid> - 2017-01-02 19:07 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Gareth Owen <gwowen@gmail.com> - 2017-01-03 06:45 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year Wolf K <wolfmac@sympatico.ca> - 2017-01-03 09:42 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year "Cybe R. Wizard" <cybe_r_wizard@WizardsTower.invalid> - 2017-01-03 11:27 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Caver1 <caver1@inthemud.org> - 2017-01-03 14:25 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-03 17:34 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Storkamp <mstorkamp@yahoo.com> - 2017-01-02 14:20 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Wolf K <wolfmac@sympatico.ca> - 2017-01-02 15:36 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-04 12:09 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Wolf K <wolfmac@sympatico.ca> - 2017-01-04 19:12 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Wally W. <ww84wa@aim.com> - 2017-01-02 15:06 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2017-01-02 19:10 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Wally W. <ww84wa@aim.com> - 2017-01-02 22:56 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-04 12:34 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2017-01-04 15:32 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year Keith Thompson <kst-u@mib.org> - 2017-01-04 13:51 -0800
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2017-01-04 22:37 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-04 17:21 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Gene Wirchenko <genew@telus.net> - 2017-01-05 09:20 -0800
[OT] Meaning and truth (Was Re: 'Leap Second' to Be Added on New Year's Eve This Year) Wolf K <wolfmac@sympatico.ca> - 2017-01-05 13:34 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Caver1 <caver1@inthemud.org> - 2017-01-07 17:20 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Kaz Kylheku <221-501-9011@kylheku.com> - 2017-01-07 22:57 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-07 19:06 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Kaz Kylheku <221-501-9011@kylheku.com> - 2017-01-08 06:16 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-08 10:26 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2017-01-02 19:05 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James Wilkinson Sword" <imvalid@somewear.com> - 2017-01-04 00:28 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year raltbos@xs4all.nl (Richard Bos) - 2017-01-01 10:01 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year Mark Lloyd <not@mail.invalid> - 2016-12-31 14:29 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James Wilkinson Sword" <imvalid@somewear.com> - 2016-12-31 21:57 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-03 20:06 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James Wilkinson Sword" <imvalid@somewear.com> - 2017-01-04 15:44 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-04 14:11 -0500
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James Wilkinson Sword" <imvalid@somewear.com> - 2017-01-04 19:58 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year Richard Heathfield <rjh@cpax.org.uk> - 2017-01-04 16:17 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James Wilkinson Sword" <imvalid@somewear.com> - 2017-01-04 21:03 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year "Osmium" <r124c4u102@comcast.net> - 2017-01-05 14:15 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James Wilkinson Sword" <imvalid@somewear.com> - 2017-01-06 01:26 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year raltbos@xs4all.nl (Richard Bos) - 2017-01-09 17:12 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year Har-dee-har-har <YouMustBeKidding@This.Com> - 2017-01-09 09:53 -0800
Re: 'Leap Second' to Be Added on New Year's Eve This Year "J-P. Rosen" <rosen@adalog.fr> - 2017-01-10 07:20 +0100
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James Wilkinson Sword" <imvalid@somewear.com> - 2017-01-12 23:17 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year Tim <timothybil@yahoo.com> - 2017-01-13 00:51 -0600
Re: 'Leap Second' to Be Added on New Year's Eve This Year antispam@math.uni.wroc.pl - 2017-01-05 19:28 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James Wilkinson Sword" <imvalid@somewear.com> - 2017-01-05 21:41 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year Dänk 42Ø <dank@nugget.org> - 2017-01-02 07:08 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year Keith Thompson <kst-u@mib.org> - 2017-01-01 23:46 -0800
Re: 'Leap Second' to Be Added on New Year's Eve This Year Dänk 42Ø <dank@nugget.org> - 2017-01-02 21:56 +0000
Re: 'Leap Second' to Be Added on New Year's Eve This Year Keith Thompson <kst-u@mib.org> - 2017-01-02 15:38 -0800
Re: 'Leap Second' to Be Added on New Year's Eve This Year "James R. Kuyper" <jameskuyper@verizon.net> - 2017-01-03 20:26 -0500
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