This simulation-based module illustrates the universe as envisioned by early thinkers, culminating in a detailed look at the geocentric and heliocentric models. The models demonstrate the paths of the planets and the sun during their orbits, and also trace planetary and solar paths through the zodiac. Instructor resources are available including student manuals, assessment materials, and a list of the assumptions used. This resource is part of a larger collection of packaged curriculum materials by the Nebraska Astronomy Applet Project.