*Aristotle's observations had been incomplete, and his physics was qualitative and not quantitative. Others, like [[Ptolemy]], carried out systematic quantitative (numerical) measurements and developed a more systematic science.
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*Aristotle's observations had been incomplete, his interpretation a vast oversimplification. It is inconceivable that Galileo was the first person to observe a discrepancy with Aristotle's predictions. Galileo was the one who changed the course of history because he was able to assemble the observations into a coherent pattern, and also because he carried out systematic quantitative (numerical) measurements rather than just describing things qualitatively. [http://www.vias.org/physics/bk1_05_01.html]