The Grand Orrery model of the solar system depicts the correct relative orbital speeds of the planets plus relative orbital movement of Earth’s moon. Historically, a Grand Orrery showed only the "naked eye" planets out to Saturn, as they were developed in the early 18th century. Our model demonstrates 9 planets, including Pluto, and 28 moons. The Earth's moon system shows the compound motion of the moon's orbit around the Earth, while the Earth orbits the Sun. Mercury orbits 1028 times for…