A blanket, and perhaps a quick look through an astronomy book or website
As the weather starts to warm up, spend some time outdoors with your child on a clear night. Lie on a blanket with your child and look up at the nighttime sky. Count at least 20 stars. Talk about the shape of the moon. Teach your child how to wish on a star with "Star Light, Star Bright." Sing "Twinkle, Twinkle Little Star" with your younger child. If your child is older, you can talk about the differences between planets and stars (Venus and Mars are great ones to start with because they look like stars in our sky) and how some of the stars have been grouped together to form constellations. If your child loves pirates, you should also tell your child how sailors used the constellations to guide them through their travels.