In a Florence library, a 1551 astronomy book held handwritten notes that went unnoticed for centuries; a historian recognised them as Galileo’s writing from around 1590

Economic Times - Nov 12, 2026

A historian in Florence has discovered handwritten annotations believed to be Galileo Galilei’s in a 1551 copy of Ptolemy’s Almagest. The discovery sheds light on Galileo’s early engagement with geocentric astronomy before he became a leading supporter of heliocentrism. The mathematical notes and an accompanying biblical passage offer a rare glimpse into his intellectual and personal life, demonstrating how forgotten marginalia can reveal fascinating insights into history’s greatest minds.

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