1902: Greenwich Foot Tunnel opens under the River Thames - steam ferry closes.
1904-7: Poet Laureate John Masefield (1878 - 1967) lived in Greenwich.
1905: Greenwich Town Hall built.
1910: Sir Frank Dyson appointed Astronomer Royal at Greenwich Royal Observatory.
1916: British Summer Time was introduced in the UK
1919: New Time Ball installed on Greenwich Royal Observatory
1933: Sir Harold Spencer Jones appointed Astronomer Royal at Greenwich Royal Observatory.
1937: National Maritime Museum, established at Greenwich.
1954: Last observations at Royal Observatory in Greenwich.
1956: Sir Richard Woolley appointed Astronomer Royal.
1957: Cutty Sark open to public.
1958: Greenwich Royal Observatory moves to Herstmonceux.
1967: Francis Chichester arrives at Greenwich in Gipsy Moth IV and knighted by Queen Elizabeth II (using the same sword used by Queen Elizabeth I to knight Sir Francis Drake in 1582)
1967: Second bore of Blackwall Tunnel opens.
1972: Sir Martin Ryle appointed Astronomer Royal.
1972: Former Greenwich resident Poet Laureate Cecil Day-Lewis (1904 - 1972) died.
1981: First London Marathon starts in Greenwich.
1982: Sir Francis Graham Smith appointed Astronomer Royal.
1982: Thames Barrier constructed.
1986: Co-ordinated Universal Time (UTC) replaces Greenwich Mean Time (GMT) as standard definition of time.
1990: Greenwich Royal Observatory moves to Cambridge
1991: Arnold Wolfendale appointed Astronomer Royal.