The royal observatory greenwich rog known as the old royal observatory from 1957 to 1998 when the working royal greenwich observatory rgo moved from greenwich . Stand on the greenwich meridian line visit the free museum telling the history of time and astronomy and catch a show at londons only planetarium. The prime meridian the line marker outside the observatory latitude and longitude are the means by which a ship is able to discover its whereabouts and thus be . The old royal naval college king charles block and queen anne block old royal naval college from the queens house click to enlarge image the palace of placentia
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