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A Writer's Dictionary:

planetarium Definition


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planetarium
noun planetaria, planetariums
    1. A special projector by means of which the positions and movements of stars and planets can be projected on to a hemispherical domed ceiling in order to simulate the appearance of the night sky to an audience seated below.
    2. The building that houses such a projector.
Etymology: 1920s in these senses; 18c referring to an orrery: from Latin planetarius planetary.



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