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A planetarium (…) is a theatre built primarily for presenting educational and entertaining shows about astronomy and the night sky, or for training in celestial navigation.
https://en.m.wikipedia.org/wiki/Planetarium
What’s the term for reverse planetarium that shows contents outside of the sphere instead of inside and showing ads instead of educational astronomy shows?
I would say a billboard
I’d say this is more of a billball. Sorry, everyone.