Orbits of the Moon and Planets :
Activities for the Classroom
Build a Scale Model of the Solar System
Students can build a scale model of the Solar System, starting with selecting the size they would like their Sun to be.
Modeling the Night Sky
Students model the motions of some objects in the Solar System as they orbit the Sun, relative to background constellations.
This is a series of middle school activities, in which students define elliptical orbits and examine Kepler's laws.
There are a couple of activities here that examine ellipses and create a scale model of the Solar System on a playground.