Just last week I visited Eise Eisinga’s planetarium in Franeker, The Netherlands (https://www.planetarium-friesland.nl/en/ https://www.planetarium-friesland.nl/

Just last week I visited Eise Eisinga’s planetarium in Franeker, The Netherlands (https://www.planetarium-friesland.nl/en/ https://www.planetarium-friesland.nl/en/). Finished in 1781, he used only wood and nails to fit an intricate and quite accurate orrery in the ceiling of his fairly modest house. This Instructable is very enticing!