[tz] What is LMTZ?
lester at lsces.co.uk
Wed Sep 18 16:17:13 UTC 2013
Alan Barrett wrote:
>>> You often mention "LMTZ". What does that term mean?
>> It was my attempt at separating the early LMT times everywhere, and the early
>> standardisations to an LMT based 'zone'
> What is an LMT based zone? Zones are geographical areas, whereas LMT is
> associated with points.
>> Naively I assumed that would be an easier transition than it obviously
>> actually is? So we just move the switch-over point from 'location' based time
>> to timezones?
> Sorry, I am still too confused about your terminology to try answering that.
Hopefully we can agree that pre standardisation, people based their local time
on 'midday' which is what what Local Mean Time is. and different locations have
a different offset. Anything on the same longitude will be the same time.
When people started standardising they agreed on a Local Mean Time that applied
across a bigger area. Now while towns may be on the same longitude their time
offset would be different depending on the other locations in their group? I'm
probably wrong but I am fairly sure that 'summer-time' or 'daylight saving is a
20th century invention? So prior to that all time was 'mean time' and it just
depended on which longitude was being used to set it. 1915 started messing
things up with the first varying time rules?
Up until 1915 all we need to know is how the 'offset' from LMT was set when
groups of locations agreed on a standard ... which is my 'LMTZ' data.
Lester Caine - G8HFL
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