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Date: 2011-11-14 11:42:29 Solar 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		Add to Reading List Source URL: www.nasonline.org Download Document from Source Website File Size: 98,14 KB Share Document on Facebook

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