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Palomar Observatory
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===Palomar Observatory and light pollution=== Much of the surrounding region of Southern California has adopted shielded lighting to reduce the [[light pollution]] that would potentially affect the observatory.<ref>[http://www.darksky.org/mc/page.do?sitePageId=55060&orgId=idsa International Dark-Sky Association] {{webarchive|url=https://web.archive.org/web/20080101110647/http://www.darksky.org/mc/page.do?sitePageId=55060&orgId=idsa |date=2008-01-01 }} (IDA): [http://data.nextrionet.com/site/idsa/is020.pdf "Sky Glow Effect on Existing Large Telescopes"] {{Webarchive|url=https://web.archive.org/web/20110714180114/http://data.nextrionet.com/site/idsa/is020.pdf |date=2011-07-14 }}, IDA Info #20.</ref>
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