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So I'd be better off to sell the rights to Edmund Scientific, and then I'd receive royalties from their sales. Less profitable, but less risky. By simple, I mean along the lines of the Antikythera mechanism and without electronics, batteries, software, downloads, etc. Set it up, see where it's pointing into the sky, and there's your planet. Simple.
Free planet finder apps are available on the net ... e.g http://www.lightandmatter.com/area2planet.shtmlAnd plastic versions for luddites ... http://www.onbrightsky.co.uk/stuff.htm#ephemeris