And while it is cool it's not really precise as advertised. He states the reasons why he didn't make it full size but one thing I missed in reading, and maybe he mentioned it, is that some of the planets are on a tilted axis of rotation relative to the bulk of the planets. Small detail, though. It's still cool.
An interesting gadget. Lots of gearing. I guess each gear must have a precisely computed number of teeth to keep the motions correctly relative to the others, or the main drive gear. And then there's Pluto, with its eccentric orbit that bobs above and below the plane of the other planets. I think it's something of a miracle of computation.
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