This is a description of a planetarium or orrery. The Derby Orrery does not show mean distance, but demonstrated the relative planetary movements. Sir Roger Boyle was created Earl of Orrery in 1660. Charleville was founded in 1661 by Roger Boyle, 1st Earl of Orrery. In 1770, Rittenhouse completed an advanced orrery. The Human Orrery, launched in 2004, is located close to the main Observatory building. It is now identified as the barony of Orrery and Kilmore. The college then acquired ownership of the orrery. It is the oldest working orrery in the world. A large orrery was installed in 2013. The term orrery has only existed since 1714. The Sun in a brass orrery provides the only light in the room. Posidonius constructed an orrery, possibly similar to the Antikythera mechanism. The Earl of Cork and Orrery was educated at Harrow School. He was dismissed for political reasons in December and replaced by the Earl of Orrery.