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| Keywords: Scheiners sun spots.jpg en Observations of sun spots de Beobachtung der Sonnenflecken http //fermi imss fi it/rd/bdv /bdviewer/bid 000000367767 From Book Rosa Ursina page 273 1630 en en Christoph Scheiner de de Christoph Scheiner Scheiners sun spots crop jpg Christoph Scheiner PD-old-100 | ||||
