
We climbed up Primrose Hill late last Sunday night, hoping to see the Perseids. We did everything wrong; early rather than late, the centre of London, and only hung around for a while (hard to keep a very tired 7-year old interested for long) but we still glimpsed a few. And it was rather magical.
And then, today, I read a brilliant article in the New Yorker about light pollution (abstract here, no full text online apparently). And it struck me that this might be one of those issues you could get people interested in. There'll have to be a huge bundle of ideas, actions and activities if we're going to get more responsible in our energy use - not one huge idea - and this might be one which catches people's imagination, because it seems to have everything going for it. Lighting the ground and not the sky saves money, increases safety and gives us back the stars.
Some points from the article:
Someone looking at the night sky over New York sees less than one percent of the stars that Galileo would have seen.
Installing 'full cutoff' lighting (ie lighting that shines where you want it, not up at the sky and not straight in your eyes) in public spaces can save huge amounts of money in energy bills because you can reduce the wattage per light.
And I really liked the fact that you can often increase visibility by decreasing the amount of lighting.
Because our eyes adapt to the brightest light present, if you've got a huge 'glare bomb' - an unshielded light - all it really does is create more darkness, because our eyes can't adapt to see anywhere other than the immediately illuminated area. (Doesn't there seem to a big juicy metaphor in there for something?) This often means that lights installed in the name of safety just end up creating huge pools of darkness for criminals to plot their dastardliness.
And there's a huge emotional pay-off - we'd be able to see the stars again. As opposed to the interior of Top Shop - which looks like this at night:

How is that amount of lighting necessary all night?
You can find out more at The International Dark-Sky Association, who have a splendid motto - Carpe Noctem.