On Mon, 5 Jan 2009, Rob Seaman wrote:
Is it too much to ask that an attempt be made to describe how the logistics
would work?
Exactly the same way that current time zones work. Every so often,
jurisdictions that become dissatisfied with their current timezone offset
or DST arrangements because
Zefram skrev:
Magnus Danielson wrote:
They also made a
correction for the accumulate error to restore phase relationships.
Except that this correction was faulty. By the mid 16th century, the
phase relationship between the seasons and the
Tony Finch wrote:
The reason DST exists is to more closely sync our activities to
sunrise.
The reason DST exists is because it has become a self-propagating
cultural meme.
Your April Fool's post on risks may be the most coherent analysis I've
read on the subject. (Not trying to be
On Tue, 6 Jan 2009, Rob Seaman wrote:
Your April Fool's post on risks may be the most coherent analysis I've
read on the subject [of DST].
Thanks :-)
Where I grew up in the U.S. mid-Atlantic states, the most obvious effect of
DST was to extend the usable hours of daylight for Summer
Tony Finch wrote:
This is why DST is a sensible solution to the problem of the
mismatch between natural human preferences and inflexible timetables
based on mean solar time.
I don't think inflexible is the right choice of words, but I'll let
it pass to make a more basic point. DST only
On Tue, 6 Jan 2009, Rob Seaman wrote:
Tony Finch wrote:
This is why DST is a sensible solution to the problem of the mismatch
between natural human preferences and inflexible timetables based on mean
solar time.
I don't think inflexible is the right choice of words, but I'll let it pass
On Tue, 6 Jan 2009, Rob Seaman wrote:
To return to a previous point, Tony Finch wrote:
Note that there's no need for global co-ordination. Each country (or
county) can change when it is convenient for them. The effect would
probably be a shifting of timezone boundaries in lumps and bumps
- Original Message -
From: Rob Seaman sea...@noao.edu
To: Leap Second Discussion List leapsecs@leapsecond.com
Sent: Tuesday, January 06, 2009 5:30 AM
Subject: Re: [LEAPSECS] Reliability
Tony Finch wrote:
The reason DST exists is to more closely sync our activities to
sunrise.
Tony Finch wrote:
I think for real time you mean local civil time, and for civil
time
you mean atomic time.
Not precisely, but that's the gist.
In the future that role would be taken by atomic time. Yes it won't
trivially relate to any kind
of local time at any place on earth, like UTC
Thank you for the discussion so far.
On Mon, Jan 05, 2009 at 04:31:44PM -0700, Rob Seaman wrote:
Adi Stav wrote:
what problems could exceeding the tolerance(s) cause?
Well covered in the archive. For astronomy, 1 second of time is 15
seconds of arc on the equator. This is a large error
On Sun, Jan 04, 2009 at 08:58:29PM -0700, Rob Seaman wrote:
Here's a notion I don't recall seeing before on the list:
Coordinate leap seconds with leap days. Introduce an integral number of
leap seconds each February 29th. Discuss.
February 29th does not start and end all over the world at
On 2009-01-06, at 22:35, Adi Stav wrote:
I am trying to identify a requirement for civil time having a low
(say,
below 30 minutes) DUT.
I would say that the actual requirement is for DUT to stay within a
small interval. Of course this also implies a low DUT, but debating
the need for a
This is the part I disagree with. Global civil time (the underlying
timescale for the numerous local civil time variants) needs to be
stationary with respect to mean solar time. The requirements for
Rob,
A problem is what defines your stationary (what bandwidth)
and what defines mean
On Tue, Jan 06, 2009 at 11:31:52PM +0100, Nero Imhard wrote:
I believe this to be false. People's tolerance for being some fixed time
offset (modulo 1 DST hour) away from their time meridian has nothing to
do with their tolerance for this value to drift.
I see. And how would such
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