An orrery is a mechanical device that illustrates the relative positions and motions of the planets and moons in the solar system in heliocentric model. They are typically driven by a large clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms. See Wikipedia Info

A planisphere is a star chart analog computer in the form of two adjustable disks that rotate on a common pivot. It can be adjusted to display the visible stars for any time and date. It is an instrument to assist in learning how to recognize stars and constellations . The astrolabe is a predecessor of the modern planisphere. That instrument was known to the ancient Greeks. See Wikipedia Info