1. contributions to astronomy
The old physics of Aristotle and the astronomy of Ptolemy were countered by Copernicus. ... Claudius Ptolemy devised models of the universe that were in correlation to Aristotelian natural philosophy. ... Ptolemy used a number of devices to solve many of the discrepancies in Aristotle's astronomy while still staying true to Aristotle's natural philosophy. ... Most of his discoveries and claims went directly against Aristotelian philosophy. ... These men's discoveries countered and sometimes collaborated with the natural philosophy of Aristotle and the astronomer Ptolemy. ...
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