Simple but efficient version of a planetary model of the solar system conforming to Copernican theory. The rotation axis is topped by a figure representing the Sun. Around the axis rotate the globes representing the planets with the satellites that were known at the time of construction: Mercury, Venus, the Earth and Moon, Mars with two satellites, the asteroid cluster, Jupiter with three moons (one missing), Saturn with its ring and seven satellites, Uranus with three satellites, and Neptune with one satellite. The unequal distances between celestial bodies are intended to show the different distance in the actual solar system. The mechanism can be hand-operated with a set of gears.