王立天文台とプライム・メリディアン：早朝入場ガイドツアー

Royal Observatory & Prime Meridian: Early Access + Guided Tour is a guided experience at the Royal Observatory Greenwich in London, combining early-access entry with a structured tour of the site where global timekeeping was standardised. Visitors gain entry before general opening, allowing time at the Prime Meridian line and the historic buildings of the observatory without the usual crowds. The guided tour covers the history of Greenwich Mean Time, the science of longitude, and the instruments used to establish the meridian that divides the eastern and western hemispheres. Tickets include early-access entry and the guided tour itself.