Tuesday, October 28, 2014

Monkeying with the clocks


Here in Cork we get half an hour extra daylight in the evening, though our mornings are dark. That’s because we use the same time zone as Britain whilst lying half an hour west of Greenwich. So the gloom and darkness complaint that arises at this time of year affects us less acutely. Here's a sample, in The Observer’s editorial last Sunday:-

For the next five months, the nation can again anticipate evenings marked by their gloom and darkness, thanks to Greenwich Mean Time, which was reintroduced early this morning.

Few welcome the abandonment of British Summer Time, one of the least appetising events of the calendar, and opinion polls in England and Wales make it clear there is a healthy support for the halting the practice of putting clocks back in autumn so that we have earlier sunrises and sunsets and darker evenings.


The editorial goes on to suggest that retaining British Summer Time in the winter, with the addition of an extra hour to clocks in March (Double Summer Time), would save money and lives. Lives on the roads because the evening rush hour wouldn't be so dark, and money because there would be less need for electric light in the early evening.  This kind of scheme is always referred to as daylight saving.

Greenwich Observatory. Where midday really is midday.
And it's said every year at this time when the clocks go back.  But the point I'm coming to is this: how have we got ourselves into this back to front way of running a society?  When The Observer talks of “gloom and darkness, thanks to Greenwich Mean Time”, they make Greenwich Mean Time sound like a perverse invention designed as a kind of torment.   But hey, all it means is that the Sun is at its highest in the sky at midday (in Greenwich that is). Which is exactly as it should be.  (In York too; in Bradford the Sun doesn't reach the zenith till almost 7 minutes past midday; here in Mitchelstown Co Cork, 32 minutes past.)

If we feel so strongly about dark evenings, the answer is clear. Bed at 8. Up at 4. Standard working day from 7 am to 3 pm, which even in midwinter finishes in full daylight. Outlandish? Of course. But only because sometime between the 16th and 18th centuries our forebears did something called nocturnalisation.  Staying up half the night and sleeping till half way through the morning. The daylight saving that The Observer is calling for amounts to this:  to monkey with the clocks so as to wind this nocturnalisation back, nearer to the way things once used to be. 

Jiggery pokery

I'm not really against monkeying with the clocks. I just want to get it off my chest that the whole thing’s mad.  We’ve nocturnalised our society and now we want to unnocturnalise it. Just why nocturnalisation occurred is a puzzle I wrestle with from time to time.  I touched on the history of it a couple of years ago in a piece called How we colonised the night.

As a postscript I should add that the foregoing is entirely a parochial mid-latitude issue. In Scotland monkeying with the clocks probably wouldn't work. And in Luleå no amount of jiggery pokery is going to stretch out the three or four hours of watery light that’s the midwinter ration. In the tropics on the other hand, the Sun never rises and sets far from 6 o’clock.  I remember when I was in Trinidad in my youth observing that the earliest sunset was 5:45, and the latest sunset was 6:15. Here's a flavour of the conversation you would have sitting on the porch sipping rum and coke and the crickets chirping. “You noticed the sun’s setting much later now?” ... “Yes,
tonight it was 7 minutes past. Two weeks ago it was 4 minutes past.”

Finally, here's a useful short history of daylight saving measures. Double Summer Time was first used in Germany in the First World War, quickly followed by Britain and many other countries.

3 comments:

  1. Is it because of international trade? If we finished our working day at 3 PM, we would be pulling down our shutters just as America was raising theirs.

    ReplyDelete
  2. But the question remains, why do they operate the came skewed system in America and everywhere else? Having thought some more, I suspect it was the 18th century aristocracy wanting to show off their wealth by burning candles late into the night. Being idle rich they had scant need to pay attention to economic factors like daylight saving.

    ReplyDelete
  3. Eddie, a Cork Astronomy Club member, adds the following perspective on the clock situation in Ireland, which straddles the dividing line (at 7 degrees 30 minutes West) between the GMT and GMT-1 time zones:

    The UK and other EU countries run on their standard time in winter, and put their clocks forward an hour to achieve "daylight saving" in summer. In Ireland, while we are part of the time zone centred on the Greenwich meridian, our standard time is actually what we use in summer (IST - Irish Standard Time). So for the winter we put our clocks back an hour, to give us better daylight in the mornings.

    Functionally, it is equivalent to what the UK does and means we use the same time as they do, but in legal terms it is for diametrically opposite reasons.

    ReplyDelete