Light pollution has greatly diminished how well individuals around the world can view the night sky. For the past decade, the National Optical Astronomy Observatory has hosted Globe at Night, a citizen science project that collects global data about light pollution. The project invites participants to fill out a form that details their location, the sky conditions, and what constellations they observe. On this website, visitors can explore collected data in a variety of ways, including an Interactive Data Map, a Regional Map Generator, and an Interactive Data Map. In 2015, Globe at Night collected data from 105 countries. Thanks to widespread citizen participation in this project, Globe at Night provides useful information for stargazers around the world. Those interested in participating can find more information here.
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