Found 1 comment on HN
mast · 2016-01-20 · Original thread
Very cool.

It reminds me about a book I read called "In Search of Planet Vulcan" (http://www.amazon.com/In-Search-Planet-Vulcan-Clockwork/dp/0...). Before Einstein, astronomers tried to explain the motion of Mercury by suggesting there might be another planet inside Mercury's orbit.

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