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This lesson includes an introduction to the geocentric models of the universe proposed by Aristotle and Ptolemy. It also introduces the "problem" of retrograde motion of inner planets and how scientists sought to explain retrograde motion pre-heliocentric model.
This resource was reviewed using the Curriki Review rubric and received an overall Curriki Review System rating of 3, as of -0001-11-30.
This resource received a 3* rating because it is part of the larger resource A Tour of the Universe, which received a rating of 3-Exemplary in the Curriki Review System. You can learn more about this larger resource by reading its review and comments.