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Observations of sunspots, May 1644. On right is a large spot which is shown in a series of successive positions due to the Sun's rotation. From Selenographia by Johannes Hevelius (Gedani, Gdansk, Danzig, 1647). Engraving.
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Creative#:
TOP09160346
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達志影像
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RM
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須由TPG 完整授權
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