orrery
n. மணிப்பொறி போன்றிறங்கும் மண்டல அமைப்புக்கருவி.
Or"re*ry, n.; pl. Orreries. Etym: [So named in honor of the Earl of Orrery.] Defn: An apparatus which illustrates, by the revolution of balls moved by wheelwork, the relative size, periodic motions, positions, orbits, etc., of bodies in the solar system.