| an apparatus or model for representing the solar systems | an apparatus or model for representing the solar systems |
| an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome | an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome |
| a building housing an instrument for projecting the positions of the planets onto a domed ceiling | a building housing an instrument for projecting the positions of the planets onto a domed ceiling |