Description: Description: This programme opens with the presenter beginning a trip down the river from Westminster Pier to Greenwich. Along the way, original footage of iconic landmarks are captured including County Hall, Big Ben, Festival Hall, Blackfriars Bridge, Bankside Power Station, St. Paul's Cathedral, London Bridge, Tower Bridge, the Pool of London, Tower of London, ships unloading goods on the quays and Greenwich Palace. Using old prints, portraits and maps, a short history of Greenwich Palace is provided referencing Elizabeth I, Sir Walter Raleigh, Sir Francis Drake. In particular, the expeditions of Sir Francis Drake are animated using a world map and a choice selection of navigational instruments common during the Tudor period. Building on this, a brief history of ship navigation and the growing importance of determining longitude to aid sailors is discussed. To help the viewer understand more about the development of longitude and the Meridian line, the work of John Flamsteed is detailed. Using his portrait and a print of the Octagon Room he worked from, the narrative soon transitions into a re-enactment (with actors) of the role Flamsteed played in calculating various celestial phenomena and solar/lunar patterns. Reference is made to Isaac Newton's interest in his work and the publication of 'Historiae Coelestis' by Flamsteed in 1712. From the Observatory, the viewer is shown the architecture of Sir Christopher Wren including the old Greenwich Hospital (now Naval College). To end the programme, a history of the Cutty Sark and the achievements of Francis Chichester on the Gypsy Moth IV in 1966 are both described using original footage and photographs. Colour/B&#38W: Black and White. Key Subjects: River Thames