6 letters · 9 points in Scrabble
noun planetarium consisting of an apparatus that illustrates the relative positions and motions of bodies in the solar system by rotation and revolution of balls moved by wheelwork; sometimes incorporated
originNamed after Charles Boyle, 4th Earl of Orrery (1676–1731), for whom such a device was made. The placename is from Irish Orbhraighe, originally the name of a tribe (Orbh-raighe (“Orb's people”)), and then of a territory and a barony.
Etymology from Wiktionary, CC BY-SA 3.0