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Orbits
13. Lay the orbital plane on the table. Wrap one of the pieces of wire half-way around the inside of the cut-out circle. Mark the paper at the two ends of the wire.

14. Line a ruler up with a two marks that you just made, and draw a line to the edge of the same paper on each side. 

15. Cut the orbital plane in half along this line, and set the two halves aside.

16. Take the equatorial plane, place it around the equator and secure it with tape.

17. Put the orbital plane (now in two halves) at an angle to the equatorial plane. (This will take two hands.) The angle between the two planes is the angle of inclination. (The angle should be about 50°.)

18. Tape the orbital plane to the equatorial plane and to the ball so that the orbits are face up. Remember: The orbital plane is a continuous plane.

Compare your model with the classroom model. 

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