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Le Macchie Solari - 1655, by Galileo Galilei

This is the second edition of Galileo's collected letters on sunspots. Galileo announced the discovery of sunspots in these letters. From these observations he determined that the sun rotated on its axis. The first edition was printed in 1613.

Galileo's sunspot sketches have received a modern makeover using artificial intelligence. Galileo’s sunspot sketches get AI-enhanced makeover