The "Pi in the Sky" math challenge gives students a chance to take part in recent discoveries and upcoming celestial events, all while using math and pi just like NASA scientists and engineers. In this problem from the set , students use the mathematical constant pi to measure the approximate size of the shadow that will fall on Earth during a total solar eclipse. Materials Pi in the Sky 4: Epic Eclipse worksheet – download PDF Pi in the Sky 4 answer key (second problem) – download PDF Backgrou