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/0738208892 http://

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/0738208892 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.