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Light pollution is the human-made alteration of outdoor light levels from those ocurring naturally. It has harmful effects on:

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By Staff
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2018 marks 30-years of night sky advocacy. This fight to protect the night couldn’t happen without YOU! Here’s another way to join the cause: design your own t-shirt and slogan, and enter your design into our International Dark Sky Week t-shirt design contest.
Create a t-shirt design with a slogan. Your design should help bring awareness to International Dark Sky Week and IDA’s work to protect and restore night skies. (Here are a few of our past designs.) IDA will choose the top three designs and post them on our social media feeds. The dark sky digital community will choose the final winner!
E-mail your design as an .eps, .pdf, .jpg or .png file to [email protected] before February 23, 2018. Make sure to include:
The top-three designs will receive prizes.
Third place:
Second place:
First prize: