On December 1, 1967, the Isaac Newton Telescope of the Royal Greenwich Observatory at Herstmonceux was inaugurated by Queen Elizabeth II. The telescope was the biggest telescope by aperture in the British Isles. It was moved to Roque de los Muchachos Observatory in Spain's Canary Islands in 1979. In 1990 the RGO moved to Cambridge. At Herstmonceux, the castle grounds became the home of the International Study Centre of Queen's University, Kingston, Canada and The Observatory Science Centre, which is operated by an educational charity Science Project.