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Date: 2013-05-17 14:28:17Light sources Space Optics International Dark-Sky Association National Dark-Sky Week Dark-sky preserve Night sky Sky Naked eye Observational astronomy Astronomy Light pollution | IDA eNews: Night Watch 1 April 2013Add to Reading ListSource URL: www.darksky.orgDownload Document from Source WebsiteFile Size: 1,07 MBShare Document on Facebook |