Help measure how the night sky is changing

International Year of Light Blog

On March 14 and September 12 2015, you can join thousands of people around the world in measuring how bright the night sky is where you live. The results from this experiment will help scientists to understand how the night sky is changing over time, as cities switch to LED street lighting. All you need is a place that’s not too close to any street lamps where you have a view of a good portion of the night sky, and clear skies on that night.

View of the Orion Constellation at three different levels of skyglow. Which one looks like your night sky?. Credits: Christopher Kyba View of the Orion Constellation at three different levels of skyglow. Which one looks like your night sky?. Credits: Christopher Kyba

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