Why ZULU time?
Guest
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'cos there are 24 time zones, named Aplha to Zulu, excepting India and Oscar (they look too much lie a 1 and a 0 respectively) and the zones go around the globe clockwise. This means Paris and Berlin are in Alpha time etc etc. GMT is the last on the list. QED Zulu time.
Guest
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it's from the old way the world time zones were defined.
24 hours in the day = 24 time zones and they were all given letters of the alphabet (i don't know which two letters were not used).
most of continental europe being 1 hour ahead of gmt was known as 'A' (alpha) time and 2 hours ahead 'B' (bravo) etc etc until you get back round to gmt which was called 'Z' (zulu) time.
hope that makes sense.
[This message has been edited by wild turkey surprise (edited 20 June 2001).]
24 hours in the day = 24 time zones and they were all given letters of the alphabet (i don't know which two letters were not used).
most of continental europe being 1 hour ahead of gmt was known as 'A' (alpha) time and 2 hours ahead 'B' (bravo) etc etc until you get back round to gmt which was called 'Z' (zulu) time.
hope that makes sense.
[This message has been edited by wild turkey surprise (edited 20 June 2001).]
Guest
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That must annoy Sydney being on Kiwi time 
Who thought up this UTC crap anyway? I am presuming the french as they have been wanting to move 0 deg long for years.
MJ
[This message has been edited by mad_jock (edited 20 June 2001).]
[This message has been edited by mad_jock (edited 20 June 2001).]
Who thought up this UTC crap anyway? I am presuming the french as they have been wanting to move 0 deg long for years.
MJ
[This message has been edited by mad_jock (edited 20 June 2001).]
[This message has been edited by mad_jock (edited 20 June 2001).]
Guest
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Alpha is "local" time
Zulu is GMT [noe UTC]
Now since FPLs are filed with eet's then I don't think that the difference is [that] important, but I could be wrong..It has been known, honest
we aim to please, it keeps the cleaners happy
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chiglet
[This message has been edited by chiglet (edited 21 June 2001).]
Zulu is GMT [noe UTC]
Now since FPLs are filed with eet's then I don't think that the difference is [that] important, but I could be wrong..It has been known, honest
we aim to please, it keeps the cleaners happy
------------------
chiglet
[This message has been edited by chiglet (edited 21 June 2001).]
Guest
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MJ et al,
"Zulu" is 'normal' GMT time. Not "summer, double summer" or owt else. Why "Zulu"? I know not. Why UTC? Universal Time Constant put forwards by our European fiends [no spelling mistook]
Why "Zuku"? To keep tack of long haul a/c in the 50's/60's taking ages to cross the Atlantic and they had to have a base line.
If you think of a better explanation please tell me. :
we aim to please, it keeps the cleaners happy
------------------
chiglet
[This message has been edited by chiglet (edited 21 June 2001).]
[This message has been edited by chiglet (edited 21 June 2001).]
"Zulu" is 'normal' GMT time. Not "summer, double summer" or owt else. Why "Zulu"? I know not. Why UTC? Universal Time Constant put forwards by our European fiends [no spelling mistook]
Why "Zuku"? To keep tack of long haul a/c in the 50's/60's taking ages to cross the Atlantic and they had to have a base line.
If you think of a better explanation please tell me. :
we aim to please, it keeps the cleaners happy
------------------
chiglet
[This message has been edited by chiglet (edited 21 June 2001).]
[This message has been edited by chiglet (edited 21 June 2001).]
Guest
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Alpha is only local time if you live in a zone that is 1 hour ahead of zulu.
Yes FPLs use eet but it's darned important that you get your departure time right =zulu.
I always thought utc was a french phrase - Universal Temps Co-ordinee (or something like that).
Hector pascal is, of course, exactly the same as a Millie Bar ......but i still don't know who he is! (drag artist perhaps?).
Yes FPLs use eet but it's darned important that you get your departure time right =zulu.
I always thought utc was a french phrase - Universal Temps Co-ordinee (or something like that).
Hector pascal is, of course, exactly the same as a Millie Bar ......but i still don't know who he is! (drag artist perhaps?).
Guest
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Pigboat
wrt pressure
pascal is a derived SI unit and is defined as 1 newton per square meter. As this is a very small pressure then atmospheric pressure = app 100 000 Pa. This was defined in the past as 1 bar. Unfortunately neither bar nor pascal is a realistic scale for human perception, so it was decided to use 1/1000 bar (= millibar). Under SI international measurement regulations, every unit should be derived from the 3 defined units of kilogram, metre and second. This means that bar is the official unit of pressure, but 100 Pa being a more usable unit, pressure is stated in hecto (=100) pascals. From the above equivalence of 100 000 Pa = 1 bar then 1 hPa =1 mb, so they are exactly the same, just that hPa is an SI unit; mb isn't. UTC is time at 0º; which of course is the same as GMT but more 'politically correct' as it does not refer to a specific geographical location
wrt pressure
pascal is a derived SI unit and is defined as 1 newton per square meter. As this is a very small pressure then atmospheric pressure = app 100 000 Pa. This was defined in the past as 1 bar. Unfortunately neither bar nor pascal is a realistic scale for human perception, so it was decided to use 1/1000 bar (= millibar). Under SI international measurement regulations, every unit should be derived from the 3 defined units of kilogram, metre and second. This means that bar is the official unit of pressure, but 100 Pa being a more usable unit, pressure is stated in hecto (=100) pascals. From the above equivalence of 100 000 Pa = 1 bar then 1 hPa =1 mb, so they are exactly the same, just that hPa is an SI unit; mb isn't. UTC is time at 0º; which of course is the same as GMT but more 'politically correct' as it does not refer to a specific geographical location
Guest
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Tin..
Mervin or Clarabelle would be interesting. But why not just GMT.
I am sure you can fly across the atlantic on GMT and be able to standardise your arrival and departure times just as easlily as with Zulu.
Why have three names for the same thing Zulu, GMT, UTC, or are they subtly different.
I assume GMT predates the rest of them. Why and when were UTC and Zulu added?
Mervin or Clarabelle would be interesting. But why not just GMT.
I am sure you can fly across the atlantic on GMT and be able to standardise your arrival and departure times just as easlily as with Zulu.
Why have three names for the same thing Zulu, GMT, UTC, or are they subtly different.
I assume GMT predates the rest of them. Why and when were UTC and Zulu added?
Guest
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This may be complete bullsh!t but anyway....
UTC stands for Unversaile Tempes Coodinaire (isn't temps weather?). It's French because the United Nations apparently reckon that French, not English, is the international language. That's why we use SI (Systeme International) units. UTC replaced GMT in 1986, probably purely a political thing.
In the late 1700's an American sea captain named Nathaniel Bowditch published a book " The American Practical Navigator". In it he proposed dividing the world up into time zones. He designated the zone 7.5 deg each side of 15 deg east of the Grenwich meridian "A", 7.5 deg each side of 30 deg east "B" etc. When he got to the International Date Line he realised that although the time was the same either side, the day was different so this 15 deg zone was split into two zones. Hence he proposed 25 time zones. He omitted to use the letter "J" as this letter was considered to be uncommon to all languages. He chose "Z" for the Greenwich time zone simply because he did.
I would hazard a guess that the use of "Z" as an abbreviation for GMT came into widespread use as radio telegraphy evolved.
Zulu time, GMT and UTC are all the same, take your pick.
Don
UTC stands for Unversaile Tempes Coodinaire (isn't temps weather?). It's French because the United Nations apparently reckon that French, not English, is the international language. That's why we use SI (Systeme International) units. UTC replaced GMT in 1986, probably purely a political thing.
In the late 1700's an American sea captain named Nathaniel Bowditch published a book " The American Practical Navigator". In it he proposed dividing the world up into time zones. He designated the zone 7.5 deg each side of 15 deg east of the Grenwich meridian "A", 7.5 deg each side of 30 deg east "B" etc. When he got to the International Date Line he realised that although the time was the same either side, the day was different so this 15 deg zone was split into two zones. Hence he proposed 25 time zones. He omitted to use the letter "J" as this letter was considered to be uncommon to all languages. He chose "Z" for the Greenwich time zone simply because he did.
I would hazard a guess that the use of "Z" as an abbreviation for GMT came into widespread use as radio telegraphy evolved.
Zulu time, GMT and UTC are all the same, take your pick.
Don
Guest
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Can't agree chiglet
zulu=utc=gmt. plus 1 hour = alpha. plus 2 hours = bravo etc.
There are 24 letters in use (excludes india and oscar) to represent the 24 hours of earth rotation.
We, in UK, are currently using alpha time. When the clocks go back in October we will use zulu time.
Local Time is just that LOCAL TIME, whether it be zulu, alpha, bravo or whatever. Simply re-setting your watch doesn't make it alpha!
zulu=utc=gmt. plus 1 hour = alpha. plus 2 hours = bravo etc.
There are 24 letters in use (excludes india and oscar) to represent the 24 hours of earth rotation.
We, in UK, are currently using alpha time. When the clocks go back in October we will use zulu time.
Local Time is just that LOCAL TIME, whether it be zulu, alpha, bravo or whatever. Simply re-setting your watch doesn't make it alpha!