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By convention, each of the 24 standard time zones is lettered, starting with
"A" for the zone whose central meridian is 15 degrees east, then "B" for 30
degrees east, through to "L" for 165 degrees east ("J" is omitted). The zone
whose central meridian is 180 degrees (nominally, the international date
line) is split in two; the half of the zone to the west of the dateline is
zone "M". Then continuing with "N" for the zone whose central meridian is 15
degrees west, then "O" for 30 degrees west, "P" and so on until "Y" which
designates the half zone to the west of the date line. That leaves "Z" for the
zone whose central meridian is the Greenwich meridian.
-- Richard Langley

On Sun, 8 Apr 2001, Robert Owens wrote:

>I don't believe you are off course at all. ZT is your geographical position 
time. Zulu time when I was growing up was mainly a military term and when I 
was flying we used Zulu time in position reports. (We would cross many Zones 
a flight so we would use GMT but call it Z). I believe it was named Zulu 
before the current name change (UTC). One letter instead of three.
>  ----- Original Message -----
>  From- Jim Laskey
>  To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
>  Sent: Sunday, April 08, 2001 11:29 AM
>  Subject: ZT
>
>
>  As the rankest of amateurs I have a simple question, the answer to which has puzzled me.
>
>  ZT, in my reading, seems sometimes to refer to Zone Time, which I interpret 
to mean the local zone time of my geographical position.  But elsewhere ZT 
seems to mean Zulu Time, which appears to mean time at Greenwich or UTC.
>
>  I would much appreciate someone explaining where I've gotten "off course" on this subject.
>
>  Thanks
>  Jim Laskey
>


===============================================================================
 Richard B. Langley                            E-mail: lang@unb.ca
 Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/
 Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142
 University of New Brunswick                   Fax:      +1 506 453-4943
 Fredericton, N.B., Canada  E3B 5A3
     Fredericton?  Where's that?  See: http://www.city.fredericton.nb.ca/
===============================================================================

   

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