Checkmate heliocentric zionist degenerate sodomites 🤓
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The shape replicates the geometry of the sky. The sky above the spherical earth geometrically lies in a dome above your hemisphere.
I think it's actually the equipment. Have you ever been to one?
Yes I have, and the equipment is specifically designed to project images onto curved domes. If you used regular projectors that are designed to take images from flat surfaces like film and project them, to a flat screen, well, that would seriously distort the relations of images objects on the curved target surface. Furthermore, planetarium projectors use curved image sources that have a light in the center!
That's the projector equipment. But, the telescope is on a tract. All the movements are circular.
A planetarium does not have a telescope. Planetariums are only theatres; observatories are what house telescopes, and their domes are designed to open and rotate to allow a telescope to move to all angles.