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687 Galileo's Handwritten Notes Discovered in a Medieval Astronomy Text

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EditorDavid @ Slashdot · 03/01/2026 10:34 EDT

Galileo's Handwritten Notes Discovered in a Medieval Astronomy Text

In a library in Florence, Italy, historian Ivan Malara noticed handwritten notes on a book printed in the 1500s — and recognized the handwriting as Galileo's. The finding "promises new insights into one of the most famous ideological transitions in the history of science," writes Science magazine — since the book Galileo annotated was a reprint of Ptolemy's second-century work arguing that the earth was the center of the universe.

Galileo's notes, perhaps written around 1590, or roughly 2 decades before hi

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