Galileo Publishes De Motu

1591

The young Galileo Galilei circulated De Motu, a manuscript treatise on motion that challenged Aristotle's physics and anticipated some of his later laws of falling bodies. The work was never formally published in his lifetime but established his reputation among progressive Italian mathematicians as a sharp and contrarian voice. The treatise's challenge to Aristotelian dynamics laid the conceptual groundwork for the laws of motion he would formalize decades later.