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Danish astronomer Olaus Röaut;mer sweeps the sky with a meridian telescope in 1689, in the middle of a 70-year span of anomalous solar behavior. See page 1189. [From Peder Horrebow, Basis Astronomiae, 1735; permission of the Houghton Library, Harvard University, Cambridge, Massachusetts]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)