Greenwich grĭn´īj, grĕn´– [key], inner borough (1991 pop. 200,800) of Greater London, SE England, on the Thames River. The borough, which is treated as an outer borough for statistical purposes, includes most of Woolwich, which was merged with Greenwich in 1965; North Woolwich, on the north side of the Thames, was incorporated into Newham. In 2012 Greenwich became a royal borough. Manufactures include telephone equipment and underwater cable.

The system of geographic longitude and time-keeping worked out at the famous Royal Observatory there have become standard in most countries of the world; the prime meridian, or long. 0°, passes through the observatory. In the 20th cent., the functions of the observatory were transferred to first to Herstmonceux, Sussex (1948–57), and later to Cambridge (1990; closed 1998). The observatory site in Greenwich subsequently functioned as museum and science center; in 2018, however, modern telescopic instruments were installed in a building there. (See also Royal Greenwich Observatory.)

Greenwich has nearly 9 mi (14.5 km) of river frontage; the huge Millennium Dome, constructed to celebrate the year 2000, is on the waterfront. Woolwich's docks and shipbuilding facilities were important from the 16th to the mid-19th cent. The Royal Naval College also was in the borough. The college building, partially designed by Christopher Wren, was originally a home for disabled sailors. On the site of the present structure (begun in the late 17th cent.) stood a palace that was the birthplace of Henry VIII, Mary I, and Elizabeth I; Edward VI died there. The grounds are now part of the Univ. of Greenwich. Greenwich's National Maritime Museum is partly housed in a building designed by Inigo Jones for Anne of Denmark. The Royal Military Academy was at Woolwich until 1947, when it merged with the Royal Military College at Sandhurst. Both Greenwich and Woolwich are mentioned in documents dating from the 10th cent. and appear in the Domesday Book.

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