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Date: 2012-12-19 12:38:12Light Astronomy Light sources International Dark-Sky Association Dark-sky preserve Dark-sky movement Street light Night sky Light-emitting diode Light pollution Observational astronomy Lighting | IDA eNews: Night Watch 1 September 2012Add to Reading ListSource URL: www.darksky.orgDownload Document from Source WebsiteFile Size: 630,77 KBShare Document on Facebook |