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Date: 2013-03-13 11:13:45Night Symbols Visibility Light sources Twilight Observational astronomy Sunset Dawn Sunrise Measurement Planetary science Astronomy | ASTRONOMICAL INFORMATION SHEET No. 7 Prepared by HM Nautical Almanac Office THE UNITED KINGDOM HYDROGRAPHIC OFFICE Admiralty Way, Taunton, Somerset, TA1 2DNAdd to Reading ListSource URL: www.ukho.gov.ukDownload Document from Source WebsiteFile Size: 37,79 KBShare Document on Facebook |