- 1. n. a building housing an instrument for projecting the positions of the planets onto a domed ceiling n. an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome n. an apparatus or model for representing the solar systems Source: ecdict
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planetariums
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ontoprojectingapparatusastronomicalbodiesbuildingceilingcelestialdevicedomedomedhemisphericalhousingimagesinnerinstrumentmodelopticalphenomenaplanetspositionsrepresentingsolarsurface
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