Students model and explore how we tell a body in space is rotating. First they simulate rotation in the school yard, and then they watch movies on the internet that show both planetary features and sun-spots rotate. In this nice activity from the book Moons of Jupiter from the GEMS Program at the Lawrence Hall of Science, students do a variety of activities to simulate how cratering occurs by dropping and throwing objects at a chocolate-powder surface on top of flour. They also do calculations about the force of gravity.
Students simulate planetary impacts by throwing hard objects onto a simulated lunar surface.
Gives the answers in a table, but the best thing would be to let students calculate for themselves. More engineering than science, this activity is included here as a placeholder for dozens of such activities found around NASA sites. The technique has applications in finding icy regions on other worlds. It's no threat to Pokemon, but if you teach solar system factoids to young kids, this may be a fun review. Students use the internet to gather information and images to help determine the rotation rate of bodies in the solar system.