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Orrery

An orrery or planetarium is a scale model from our solar system. An orrery was in the past a mechanical model with radars, clocks and chains, nowadays they are mostly virtual with lasers projecting the planets and stars at a ceiling.
This website is dedicated about an electromechanical planetarium that was created after an inspirational visit to the planetarium of Eise Eisinga.

planetarium at ceiling