On 28/03/2012 15:00, Lesley Weston wrote:
> On 03-27-12 4:33 PM, Reader in Invisible Writings wrote:
>> On 27/03/2012 16:58, Lesley Weston wrote:
>
> <snip>
>>
>> GMT is only artificial in the fact that it averages when the sun is
>> overhead at noon to prevent the communication issues that arise in the
>> eras of fast communication*.
>
> There's no reason why 0-hour should run through Greenwich, except that
> the man who invented it was in the British Navy.
>
Actually it was the Royal Observatory but clearly the Royal Navy and
Ordnance Survey followed this meridian. According to Wikipedia there
were over 27 different meridians in use at one time or another but as
the majority of shipping were using the Greenwich one an international
conference opted for that as the prime meridian.
>> With our world wide communications "at the
>> speed of light", there is even more reason for having a universal time
>> frame.
>
> Not at all. Everything we use that needs to be on the same time as
> something elsewhere in the world is programmed to adjust automatically,
> without us having to get involved at all. It's a quaint survival from
> before the industrial revolution. Very occasionally, it might be useful
> to be able to calculate it oneself, just as it's useful to know Morse code.
Sorry, but before the industrial revolution you took so long to get
anywhere that you accepted local time as your watch probably could not
be relied on. Only the Navy had (eventually) reliable chronometers for
navigation. It was the advent of the railway when you could travel from
London to Bristol in 2 hours and find that it had only taken 1 hour 40
minutes, or that your watch was out by 20 mins, with similar issues on
the way back.
>>
>> What is artificial is our unbending obeisance to the time on the clock.
>
> For companies to do business together, they all have to have someone in
> the office at the same time. It doesn't hold across too many time zones
> but within the tiny British Isles, which all fit comfortably into one
> time zone, it makes sense.
>
But they could do that with a single Universal Time and is only now an
issue due to computers and the telephone. When they did business by
post nobody had to be there at the same time.
>> Why should workers on a site in the north of Scotland start at the same
>> time as ones on the south coast of England despite it being dark at one
>> and not at the other?
>
> Eh? Time zones run East-West, not North-south.
>
True, but the tilt of the Earth is north south so, in winter, it gets
lighter later the further north you go. There is no daylight to save in
the Tropics but plenty towards the poles.
>> Why should children go to school at the same time
>> Summer and Winter?
>
> Why not? It makes things much easier for their parents who have to get
> to work somewhere that is not part of the school system. If school and
> work hours both Summer and Winter were set by DST instead of GMT, then
> the kids could go home in the daylight and still have some time to play
> outside.
>
Ah - but is is better to go to school in the light rather than the dark
and then play in the streets in the dark until the parents get home...
We had an experiment with that and "The Papers" won on shear "don't like
it" rather than evidence.
>> Why do farmers milk by the clock and not by sunrise?
>
> Cows need milking when they need milking, which will be a certain number
> of hours since they were last milked.
>
But they are milked to the schedule of the tanker lorries and this
shifts one hour twice a year - irrespective of what the cows need.
>> If we had a more flexible attitude to these matters then in fact we
>> would not need daylight saving time.
>
> We don't. We just need for GMT to be one hour earlier.
>
Do you mean GMT+1 in winter and GMT+2 in the summer? I would go with
that, but just ask a Scot who thinks that GMT-1 and GMT would suit him
or her better.
>> Also, I note that the USA and
>> Canada started a week earlier than Europe.
>
> More than a week.
OK, but not on my Discworld Calendar (IIRC)
>
>> USA I can understand as
>> generally it is further south than most of Europe, but Canada is about
>> the same, so why not change when Europe does?
>
> Because our major trading partner is the US, not Europe. We already have
> enough difficulties with our being in five and a half time zones. I know
> two people in Vancouver who trade on the Asian stock markets as well.
> They have to start work at three in the morning.
>
Agreed, and it is all down to a too fixed attitude to time "Work from 9
to 5", which you are saying does not work in the instant communications
of today.
> Lesley.
>
Not really getting at you... honest