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Light Pollution: The Bortle Dark-Sky Scale

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The Bortle Dark-Sky Scale is a nine-level rating system that measures sky quality by providing observable standards. John E. Bortle, a retired fire chief and amateur astronomer, devised the rating system in 2001 as a means to help amateur astronomers evaluate the darkness of an observation site and compare sites. The scale ranges from one, an excellent dark-sky site, to nine, an inner-city sky, and specifies observable criteria for each class. Learn more about light pollution: http://www.delmarfans.com/educate/basics/lighting-pollution/

Publicado en: Medio ambiente
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Light Pollution: The Bortle Dark-Sky Scale

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