ORRERY

A fine-art celestial-instrument puzzle. Wire an antique brass orrery: each engraved body must carry exactly its number of rods, and every body must link into ONE connected train, no rod crossing another — the bridges rules of Hashiwokakero. Complete the linkage and the mechanism engages: the armillary rings spin up, the bodies light, and the heavens turn. Twelve uniquely-solvable sky-charts across three chapters — the Astrolabe, the Armillary, and the Great Orrery — plus an Observatory of every mechanism you set turning. The title screen is a live maker's demo. Pure JavaScript, no build.