Bortle Scale

Image credit: The Bortle Dark Sky Scale according to the Big Sky Astronomy Club, via

http://www.bigskyastroclub.org/lp_bortle.html

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The mission of IDA Missouri is to raise awareness about light pollution issues in Missouri, promote quality outdoor lighting, protect our natural environment and our beautiful night sky, and educate the public how reducing light pollution can lower energy costs.

Bortle Scale

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