Engraving of an instrument to observe sunspots, from "Rosa Ursina, sive sol ex admirando facularum & macularum suarum phoenomeno varius" by Christoph Scheiner (1573-1650) 581 Sunspot instrument of Christoph Scheiner (1573-1650)
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Photo credit: © History and Art Collection / Alamy / Afripics
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