These letters record astronomical observations made by the Italian physicist and astronomer Galileo Galilei.
In his letters to Marc Wesler (a banker and magistrate in the town of Augsburg, Germany) Galileo identified sunspots correctly as markings on the sun, suggesting that the sun rotated monthly, as the position of the spots moved. Modern astronomers with new technologies, however, have found that the cyclical appearance of sunspots over long and short periods are connected with increased levels of magnetic activity. #BSW19
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