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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Keywords: ., 1644, 1644., archival, archive, astronomy, due, engraving., hevelius, historical, history, johannes, large, observations, positions, rotation., science, selenographia, series, shown, spot, successive, sun, sunspots

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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