This paper describes a series of activities in which students investigate and
use the Ptolemaic, Copernican, and Tychonic models of planetary motion. The
activities guide students through using open source software to discover
important observational facts, learn the necessary vocabulary, understand the
fundamental properties of different theoretical models, and relate the
theoretical models to observational data. After completing these activities
students can make observations of a fictitious solar system and use those
observations to construct models for that system.Comment: 10 pages, 5 figures, 1 tabl