Mean Areas of Umbr , Whole Spots, and Facul upon the Sun's Disk as measured on Photographs taken at the Royal Observatory, Greenwich, for each Rotation of the Sun from 1873, July 11 | Zendy

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Mean Areas of Umbr , Whole Spots, and Facul upon the Sun's Disk as measured on Photographs taken at the Royal Observatory, Greenwich, for each Rotation of the Sun from 1873, July 11

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