How to Make a Model of the Orbit of Earth Around the Sun

Paint the large plastic foam ball yellow to represent the sun and the small plastic foam ball blue and green to represent the Earth.

Pierce the large yellow ball with a piece of wire about one inch longer than the ball's diameter. Bend the bottom of the wire upward and bury it in the plastic foam so no wire juts out of the bottom. The yellow ball is securely held on the wire.

Bend the end of the wire on the other side of the yellow ball into a loop.

Tie a string to the top of the wire going through the yellow ball.

Create an ellipse around the model sun, using more of the wire. This will represent the orbital track of the Earth.

Pierce the model of the Earth with the wire used to create the ellipse so the Earth is attached to its orbit track.

Tie a string to the orbit track of the model Earth and feed it through the loop going through the model of the sun. Attach the opposite end of that string to the opposite side of the model Earth's orbital track. Determine how long the string needs to be for the orbital track of the model Earth to hang around the model of the sun. This orbit should rest at a seven degree angle relative to the equator of the sun. Adjust the points where the string attaches to the orbital track of the Earth model accordingly.