planetarium

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

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

Borrowed from New Latin planētārium. Equivalent to planet + -arium.

The site faces Olive Hill and the distant Los Angeles Planetarium. — Autobiography of a Yogi, Paramahansa Yogananda
The planets are visible during the day in the planetarium as well as night. — Astounding Stories, August, 1931, Various
It no doubt corresponded in a great measure to our modern planetarium, or orrery, invented by the earl of that name. — Cicero's Tusculan Disputations: Also, Treatises On The Nature Of The Gods, And On The Commonwealth, Marcus Tullius Cicero

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