NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Time Zone Designations
From: Gary LaPook
Date: 2017 Jan 5, 09:10 +0000
From: David C <NoReply_DavidC@fer3.com>
To: garylapook@pacbell.net
Sent: Monday, January 2, 2017 5:43 PM
Subject: [NavList] Time Zone Designations
From: Gary LaPook
Date: 2017 Jan 5, 09:10 +0000
The island nation of Kiribati stretches across the 180th meridian from Tarawa at 173 east to Christmas island at 157 west, spanning three time zones. Tarawa keeps time with a zone description of minus 12, which is a appropriate for its longitude. The other islands in the chain that are located to the east of the 180th meridian keep time with zone description of minus 13 and minus 14 for Christmas island at the eastern end of the chain. This allows these far flung island to keep the same date as the capital of Tarawa.
gl
From: David C <NoReply_DavidC@fer3.com>
To: garylapook@pacbell.net
Sent: Monday, January 2, 2017 5:43 PM
Subject: [NavList] Time Zone Designations
The subject of time just keeps growing and growing...........
NZ is in time zone -12 ( Admiralty Manual of Navigation).
When NZST is in use zone time is UTC + 12. When NZDT is in use zone time is UTC + 13. Currently NZDT is in use.
When I have given details of an observation I have given my time as, for example, 13:43:56 (zone -13). Clearly that is incorrect as there is no zone -13. Should I give my time as:
13:43:56 (zone -12, NZDT)
13:43:56 (UTC + 13)
13:43:56 (zone -13) because -13 is added to zone time to get UTC. This is the time zone sign convention.
or some other format?
