The earth is like a giant ball spinning in the darkness of Space. The only light falling on it is the light of the sun, glowing 93 million miles away. The earth turns once a day, and it orbits the sun once a year. The experiments on these pages investigate the two ways of moving, and explain why night and day, and the seasons, occur. The ball represents the earth and the flashlight, the sun. in the final project, you can make a simple thermometer using water to record changes in temperature from night to day, and from season to season.
Felt-tipped pen, plastic ball, piece of thin string, non-hardening modeling material, flashlight.
THE SEASONSYOU WILL NEED
Felt-tipped pen, plastic ball, bowl just big enough for the ball to sit on, flashlight, books or a box to set the flashlight on.
MAKE A THERMOMETERYOU WILL NEED
Water, bottle, food coloring, clear straw, reusable adhesive, card, scissors, felt-tipped pen.