| Topic: |
Sociology > Depression |
| User: |
"Frett" |
| Date: |
26 Jan 2007 05:09:23 PM |
| Object: |
wrapping my head around zulu time, UTC time, local time. |
USA Eastern: -5 hours (Local summer -4 hours)
so when it's 0 hours in Greenwich england, the letter Z being that
place, and the phonetic alphabet calls z zulu,(UTC time, which was
called greenwich mean time till 1972, ) if it's 5:52 pm local time
(EST),
it's 22:52Z or 22:52UTC. because 22 hours and change has past since
it was midnight in greenwich, our midnight was 5 hours after that,
cause we spin west. and it's been 17 hours since our midnight. so add
the 17, plus the 5 that we waited for midnight to come past england,
and you have 22:52 utc or 22:52 Zulu.
http://www.grc.nasa.gov/WWW/MAEL/ag/zulu.htm
Now I get it. It's 23:09 UTC.....Frett unofficial timekeeper
.
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| User: "%" |
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| Title: Re: wrapping my head around zulu time, UTC time, local time. |
26 Jan 2007 05:11:40 PM |
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"Frett" <Frettbored@gmail.com> wrote in message news:1169852963.109726.283570@k78g2000cwa.googlegroups.com...
USA Eastern: -5 hours (Local summer -4 hours)
so when it's 0 hours in Greenwich england, the letter Z being that
place, and the phonetic alphabet calls z zulu,(UTC time, which was
called greenwich mean time till 1972, ) if it's 5:52 pm local time
(EST),
it's 22:52Z or 22:52UTC. because 22 hours and change has past since
it was midnight in greenwich, our midnight was 5 hours after that,
cause we spin west. and it's been 17 hours since our midnight. so add
the 17, plus the 5 that we waited for midnight to come past england,
and you have 22:52 utc or 22:52 Zulu.
http://www.grc.nasa.gov/WWW/MAEL/ag/zulu.htm
Now I get it. It's 23:09 UTC.....Frett unofficial timekeeper
its friday
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| User: "Doug Laidlaw" |
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| Title: Re: wrapping my head around zulu time, UTC time, local time. |
26 Jan 2007 10:45:31 PM |
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Frett wrote:
USA Eastern: -5 hours (Local summer -4 hours)
so when it's 0 hours in Greenwich england, the letter Z being that
place, and the phonetic alphabet calls z zulu,(UTC time, which was
called greenwich mean time till 1972, ) if it's 5:52 pm local time
(EST),
it's 22:52Z or 22:52UTC. because 22 hours and change has past since
it was midnight in greenwich, our midnight was 5 hours after that,
cause we spin west. and it's been 17 hours since our midnight. so add
the 17, plus the 5 that we waited for midnight to come past england,
and you have 22:52 utc or 22:52 Zulu.
http://www.grc.nasa.gov/WWW/MAEL/ag/zulu.htm
Now I get it. It's 23:09 UTC.....Frett unofficial timekeeper
There are two different concepts here, but the difference is largely
theoretical.
UTC for "Universal Co-Ordinated Time," is scientific time regulated by an
atomic clock. The standard second is defined a so many atomic vibrations
in length. That is VERY precise and unvarying.
GMT (Greenwich Mean Time) is average time at Greenwich, as regulated by the
Sun. The rotation of the Earth is uneven and slowing down, so every few
years the accumulated error in a GMT year becomes a second longer than a
UTC year. Then they insert a "leap second" into UTC to put it back in
step. But don't worry, the Earth won't come to a standstill for a long
time yet.
z or "Zulu time" is just another name for time in the GMT time zone.
The "Zulu" is official phonetic alphabet for z. I am in GMT+10, which has
a different letter, only I don't know what it is. I tend to use both GMT
and UTC indifferently.
(It is very convenient that the choice of Greenwich as 0 degrees put the
International Date Line right in the middle of the Pacific Ocean, and only
a few wiggles in it were required, e.g. between Alaska and Russia. I doubt
whether that was realized when they chose Greenwich.)
HTH,
Doug VK3KDI.
--
A Lifetime of happiness! No man alive could bear it; it would be hell on
earth.
- G.B. Shaw.
.
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| User: "Whiskers" |
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| Title: Re: wrapping my head around zulu time, UTC time, local time. |
27 Jan 2007 01:43:58 PM |
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On 2007-01-27, Doug Laidlaw <laidlaws@dougshost.invalid> wrote:
Frett wrote:
snip
z or "Zulu time" is just another name for time in the GMT time zone.
The "Zulu" is official phonetic alphabet for z.
The Z stands for the "zero" longitude.
I am in GMT+10, which has
a different letter, only I don't know what it is. I tend to use both GMT
and UTC indifferently.
(It is very convenient that the choice of Greenwich as 0 degrees put the
International Date Line right in the middle of the Pacific Ocean, and only
a few wiggles in it were required, e.g. between Alaska and Russia. I doubt
whether that was realized when they chose Greenwich.)
It was one factor taken into consideration at the International Meridian
Conference (Washington DC 1884) which 'fixed' the 'prime meridian' as we
now know it.
<http://www.gutenberg.org/etext/17759>
<http://www.ucolick.org/~sla/leapsecs/scans-meridian.html>
<http://wwp.greenwichmeantime.com/info/conference.htm>
--
-- ^^^^^^^^^^
-- Whiskers
-- ~~~~~~~~~~
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| User: "Frett" |
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| Title: Re: wrapping my head around zulu time, UTC time, local time. |
27 Jan 2007 04:28:04 PM |
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On Jan 27, 2:43 pm, Whiskers <catwhee...@operamail.com> wrote:
On 2007-01-27, Doug Laidlaw <laidl...@dougshost.invalid> wrote:
Frett wrote:snip
z or "Zulu time" is just another name for time in the GMT time zone.
The "Zulu" is official phonetic alphabet for z. The Z stands for the "zero" longitude.
here is a c+p from my original link.::
The world is divided into basically 24 time zones. For easy reference
in communications, a letter of the alphabet has been assigned to each
time zone. The "clock" at Greenwich, England is used as the standard
clock for international reference of time in communications, military,
aviation, maritime and other activities that cross time zones. The
letter designator for this clock is Z.
end quote
it doesn't say what the other letters are.
--Frett
I played cards with the natives.
"Zulus?"
no, I usually won.
I am in GMT+10, which has
a different letter, only I don't know what it is. I tend to use both GMT
and UTC indifferently.
(It is very convenient that the choice of Greenwich as 0 degrees put the
International Date Line right in the middle of the Pacific Ocean, and only
a few wiggles in it were required, e.g. between Alaska and Russia. I doubt
whether that was realized when they chose Greenwich.)It was one factor taken into consideration at the International Meridian
Conference (Washington DC 1884) which 'fixed' the 'prime meridian' as we
now know it.
<http://www.gutenberg.org/etext/17759>
<http://www.ucolick.org/~sla/leapsecs/scans-meridian.html>
<http://wwp.greenwichmeantime.com/info/conference.htm>
--
-- ^^^^^^^^^^
-- Whiskers
-- ~~~~~~~~~~
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| User: "Whiskers" |
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| Title: Re: wrapping my head around zulu time, UTC time, local time. |
28 Jan 2007 07:54:16 AM |
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On 2007-01-27, Frett <Frettbored@gmail.com> wrote:
On Jan 27, 2:43 pm, Whiskers <catwhee...@operamail.com> wrote:
On 2007-01-27, Doug Laidlaw <laidl...@dougshost.invalid> wrote:
Frett wrote:snip
z or "Zulu time" is just another name for time in the GMT time zone.
The "Zulu" is official phonetic alphabet for z.
The Z stands for the "zero" longitude.
here is a c+p from my original link.::
The world is divided into basically 24 time zones.
25, actually; the International Date Line cuts the +/- 24 band (around 180
degrees longitude) into two.
For easy reference
in communications, a letter of the alphabet has been assigned to each
time zone. The "clock" at Greenwich, England is used as the standard
clock for international reference of time in communications, military,
aviation, maritime and other activities that cross time zones. The
letter designator for this clock is Z.
end quote
snip
Here's one possible answer <http://www.maybeck.com/ztime/>. I've never
encountered any use being made of this system, although it might
conceivably have some utility at sea. These days, I think it's usual for
'World Time' or 'UTC' or 'GMT' (virtually the same thing, for practical
purposes) to be used all around the planet, where unequivocal notation is
required. Cosmonauts [astronauts] may well use whatever the local time is
at their principal 'ground control'.
Most countries bend the edges of the 15-degree stripes, and some ignore
them completely, for reasons of their own. (India and China spring to
mind).
These might be of interest:
<http://www.worldtimezone.com/>
<http://aa.usno.navy.mil/faq/docs/world_tzones.html>
<http://uk.ask.com/web?o=312&qsrc=6&l=dir&q=Timezone+Maps>
<http://www.maa.mhn.de/Scholar/times.html>
--
-- ^^^^^^^^^^
-- Whiskers
-- ~~~~~~~~~~
.
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| User: "Frett" |
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| Title: Re: wrapping my head around zulu time, UTC time, local time. |
27 Jan 2007 04:23:42 PM |
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On Jan 26, 11:45 pm, Doug Laidlaw <laidl...@dougshost.invalid> wrote:
Frett wrote:
USA Eastern: -5 hours (Local summer -4 hours)
so when it's 0 hours in Greenwich england, the letter Z being that
place, and the phonetic alphabet calls z zulu,(UTC time, which was
called greenwich mean time till 1972, ) if it's 5:52 pm local time
(EST),
it's 22:52Z or 22:52UTC. because 22 hours and change has past since
it was midnight in greenwich, our midnight was 5 hours after that,
cause we spin west. and it's been 17 hours since our midnight. so add
the 17, plus the 5 that we waited for midnight to come past england,
and you have 22:52 utc or 22:52 Zulu.
http://www.grc.nasa.gov/WWW/MAEL/ag/zulu.htm
Now I get it. It's 23:09 UTC.....Frett unofficial timekeeperThere are two different concepts here, but the difference is largely
theoretical.
UTC for "Universal Co-Ordinated Time," is scientific time regulated by an
atomic clock. The standard second is defined a so many atomic vibrations
in length. That is VERY precise and unvarying.
GMT (Greenwich Mean Time) is average time at Greenwich, as regulated by the
Sun. The rotation of the Earth is uneven and slowing down, so every few
years the accumulated error in a GMT year becomes a second longer than a
UTC year. Then they insert a "leap second" into UTC to put it back in
step. But don't worry, the Earth won't come to a standstill for a long
time yet.
z or "Zulu time" is just another name for time in the GMT time zone.
The "Zulu" is official phonetic alphabet for z. I am in GMT+10, which has
a different letter, only I don't know what it is. I tend to use both GMT
and UTC indifferently.
(It is very convenient that the choice of Greenwich as 0 degrees put the
International Date Line right in the middle of the Pacific Ocean, and only
a few wiggles in it were required, e.g. between Alaska and Russia. I doubt
whether that was realized when they chose Greenwich.)
HTH,
Doug VK3KDI.
--
A Lifetime of happiness! No man alive could bear it; it would be hell on
earth.
- G.B. Shaw.
So those 2 cesium clocks are in different spots on the globe, when
they don't jive with the 'great rotation', the iluminati add a leap
second. Cool. I still am trying to grasp right ascension and
declination 'star addresses' in astronomy. Almost got it.
.
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| User: "%" |
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| Title: Re: wrapping my head around zulu time, UTC time, local time. |
26 Jan 2007 11:09:05 PM |
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hi pigeon tits
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| User: "Franz Bestuchev" |
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| Title: Re: wrapping my head around zulu time, UTC time, local time. |
28 Jan 2007 02:43:11 PM |
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then Frett wrote, On 1/26/2007 4:09 PM:
USA Eastern: -5 hours (Local summer -4 hours)
so when it's 0 hours in Greenwich england, the letter Z being that
place, and the phonetic alphabet calls z zulu,(UTC time, which was
called greenwich mean time till 1972, ) if it's 5:52 pm local time
(EST),
it's 22:52Z or 22:52UTC. because 22 hours and change has past since
it was midnight in greenwich, our midnight was 5 hours after that,
cause we spin west. and it's been 17 hours since our midnight. so add
the 17, plus the 5 that we waited for midnight to come past england,
and you have 22:52 utc or 22:52 Zulu.
http://www.grc.nasa.gov/WWW/MAEL/ag/zulu.htm
Now I get it. It's 23:09 UTC.....Frett unofficial timekeeper
Just hit up www.time.gov
.
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