Abstract
The dark night sky is rapidly being lost throughout the world due to wasted outdoor night lighting. Following warnings by astronomers and environmentalists, many communities are acting to preserve the night sky by enacting outdoor lighting codes. Here we briefly recount the history of codes and outline the essential elements of an effective code. Additional information, including a handbook on how to write a good outdoor lighting ordinance, is available from the International Dark-Sky Association web site, www.ida.org.
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