evidently the architecture of the Planetarium of Stuttgart (DE) is inspired by the Maya's or Doser's and Mesopotamian step piramyds: https://en.wikipedia.org/wiki/Step_pyramid .
Jean-Luc and me were interested not only to the projection, which provided us with well known astronomical information, but to the technical means (G09B27/00 - for those familiar with the patent classification) allowing such projection. The Planetarium hosts under a cupola a modern digital "one egg" Zeiss projector wich recently replaced an old opto-mechanical "two eggs" Zeiss projector still visible in the hall of the Planetarium.
The images provide you with an idea of the capabilities of the Planetarium and its instrumentation.
Salutations
Giancarlo
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