On 2010-11-04 21:46, Zefram wrote:
There is a recent near-renaming
that shows the way: the modern form of Sidereal Time is known as Earth
Rotation Angle. This name is accurate in some important ways: it's
specific to Earth, and it's not time at all
On 2010-11-03 23:31, Steve Allen remarked:
I see the point of mean solar time not as how accurately does the
expression represent the sun over the earth? but as does the
expression even try to represent the sun over the earth?.
I think that the discussions and intentions surrounding
We often get lost on this list in the details of legal or physical timescales.
Astronomers need to know such details. Civilians need a simple mechanism. The
current civil timescale cleverly provides access to both interval time and a
measure of mean solar time in a single pragmatic
All forms of UT1 have been direct measures of earth rotation. One can
argue about zero points and drifts, but the underlying purpose of UT1
is to monitor rotation with a value that tracks where the sun is over
the earth. In that sense UT1 tries to be a form of mean solar time,
so it merits a
On Nov 4, 2010, at 2:36 PM, Tom Van Baak wrote:
Since there are quite a few more cesium atoms than there are
planet earth's one could argue that atomic time scales are more
universal than an earth/sun rotation/revolution-based scale, no?
No.
___
. The newcomers to the list may enjoy:
http://www.leapsecond.com/museum/earth/
/tvb
- Original Message -
From: Rob Seaman sea...@noao.edu
To: Leap Second Discussion List leapsecs@leapsecond.com
Sent: Tuesday, November 02, 2010 11:06 PM
Subject: Re: [LEAPSECS] A leap second proposal
In message 7ebbba3729a346d5b0aeb73d6d73b...@pc52, Tom Van Baak writes:
What would happen if instead of getting rid of leap seconds
we had *more* of them?
It really depends on only one thing: How long time in advance do
you announce which way the leapsecond goes for a given month ?
If we get 10
On 2010 Nov 3, at 00:18, Tom Van Baak wrote:
Thanks for that link (and thanks to Steve for the old USNO
archive).
The particular presentation of those old files was something I
created as an experiment. I don't like the presentation and I
may rearrange the URLs for easier scanning by humans.
Hi Tom,
The key point of LSEM is that 100% of the months would have leap seconds,
I think this is a previously undiscussed option. When +/- dithering came up
before (when the world and we were younger) the idea was that a leap second
would rather amount to the omission of one of the normal
In message 0859717c-0eb7-4af8-bb4d-38f657144...@noao.edu, Rob Seaman writes:
Universal Time *means* mean solar time.
It probably did in the 1800's, in these days of Lego-toys on Mars,
most people I have talked to, find it utterly strange that a timescale
with universal in it, depends on one
On 2010-11-03 18:43, Poul-Henning Kamp observed on
a remark by Rob Seaman:
Universal Time *means* mean solar time.
It probably did in the 1800's, in these days of Lego-toys on Mars,
most people I have talked to, find it utterly strange that a timescale
with universal in it,
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