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Date: 2013-02-04 13:17:21Light sources Space International Dark-Sky Association Dark-sky preserve Skyglow Night sky Star party European Southern Observatory Constellation Astronomy Observational astronomy Light pollution | IDA eNews: Night Watch 1 February 2013Add to Reading ListSource URL: www.darksky.orgDownload Document from Source WebsiteFile Size: 674,11 KBShare Document on Facebook |