You can see how the planets rotate, you can see the constellations, it is a great visual for teaching astronomy and for teaching about the planets and solar system.
This activity is a scaffolded process of working users through the understanding of fractions beginning with how to divide up an item through the creation of fractions. Would be a good IWB activity.
Teacher Toolbox is an interactive math and reading resource for K-5th grade. There are interactive math applets, math games, free flash cards, interactie whiteboard lessons, reading games stories for kids, professional development resources as well as printables.