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I guess the dome concept evolved from a simple series of basic elements:
the sky is a dome, 360 degrees in all directions...
therefore...
the telescope within the enclosure will be moving 360 degrees in all directions...
therefore...
the enclosure can be build in a circular shape...
therefore...
the roof can also be built in a circular shape and can move on a circular rail or track...
well, you get the picture. That's my thought process...
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