Stray light from our towns and cities is illuminating the sky over great distances and is eradicating our enjoyment of night skies. This stray light phenomenon is known as skyglow and although an awareness of the problem has been around for many years, the mechanism of skyglow, how it is created and what the key causative agents are, have not been fully appreciated. Now groundbreaking work by Dr Chris Baddiley has increased our understanding, by developing a computer model of skyglow linked to industry standard luminaire photometry files and referencing it to measured skyglow. As a result, we can now understand the mechanism behind skyglow which, at last, gives us the rationale to successfully tackle this problem. Published September 2007

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