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![]() Date: 2011-11-14 11:42:29Solar variation Solar constant Samuel Pierpont Langley Abbot Charles Doolittle Walcott Smithsonian Astrophysical Observatory Sun Smithsonian Institution Loyal Blaine Aldrich Science Charles Greeley Abbot United States | Source URL: www.nasonline.orgDownload Document from Source WebsiteFile Size: 98,14 KBShare Document on Facebook |