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Date: 2002-04-18 15:08:05Space Bortle Dark-Sky Scale International Dark-Sky Association Skyglow Limiting magnitude Sky brightness Apparent magnitude Naked eye Night sky Observational astronomy Astronomy Light pollution | Chadwick A. Moore Visual Estimations ofAdd to Reading ListSource URL: www.georgewright.orgDownload Document from Source WebsiteFile Size: 294,91 KBShare Document on Facebook |
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