The Royal Observatory is a historic observatory situated in Greenwich Park in London. It played a major role in the history of astronomy and navigation. The site is best known as the location of the prime meridian, where the designation of Greenwich Mean Time was established. It was commissioned in 1675 by King Charles II, with the foundation stone laid on 10 August. The building of the observatory was entrusted to the famous architect Sir Christopher Wren. Now a museum, it houses astronomical and navigational tools, including John Harrison's timepieces, which solved the problem of determining longitude at sea, enabling safer and more accurate navigation. The location offers a breathtaking view of the London skyline as you stand on the symbolic Meridian Line. Visitors can explore the historic rooms, including the Octagon Room, the Time Galleries, and the Great Equatorial Telescope. The site is part of the Maritime Greenwich World Heritage Site, which also includes the Queen's House and the National Maritime Museum. The Royal Observatory remains an iconic symbol of scientific advancement and maritime history.