The Royal Observatory is part of the Unesco World Heritage Site of Maritime Greenwich.
The Royal Observatory, Greenwich (formerly the Royal Greenwich Observatory or RGO) was commissioned in 1675 by King Charles II. The king also created the position of Astronomer Royal, with John Flamsteed being the first to occupy the position, as the director of the observatory and to "apply himself with the most exact care and diligence to the rectifying of the tables of the motions of the heavens, and the places of the fixed stars, so as to find out the so much desired longitude of places for the perfecting of the art of navigation." The Royal Observatory, Greenwich, is situated on a hill in Greenwich Park in Greenwich, London, overlooking the River Thames.
The original part of the Observatory was called Flamsteed House. It was designed by Sir Christopher Wren as the first purpose-built scientific research facility in Britain. It was built for a cost of £520 (£20 over budget) using recycled materials on the foundations of Duke Humphrey's Tower. Due to the cost cutting measure, the alignment of the observatory was 13 degrees away from true North, much to Flamsteed's chagrin. Flamsteed House contains the scientific instruments used by Flamsteed in his work on stellar tables.
Until 1954, Greenwich Mean Time (GMT) was based on the time observations made at Greenwich. After that, GMT was calculated from observations made at other observatories which were still active. Today GMT is often called Universal Time, because it is now calculated from observations of extra-galactic radio sources and then converted. To help others synchronize their clocks to GMT, a time ball was installed by Astronomer Royal John Pond in 1833. It still drops daily to mark the exact moment of 1 p.m. (13:00) year round (GMT during winter and BST during summer).
Royal Observatory, Greenwich - notice the time ball at the top
by Kjetil Bjørnsrud, http://en.wikipedia.org/wiki/Image:Royalobs.jpg, and used under GNU Free Documentation License
The difference between Royal Observatory, Greenwich and Royal Greenwich Observatory
For much of the 20th century, the Royal Greenwich Observatory was not at Greenwich. The last time all the departments were there was in 1924: the arrival of the railway that year affected the readings of the Magnetic And Meteorological Department and forced it to move out, to Abinger. Many departments were also evacuated in 1939, on the on set of World War II to the countryside, to places such as Abinger, Bradford, and Bath, and activities in Greenwich were reduced to the bare minimum.
After the War, the Royal Greenwich Observatory departments were moved to Herstmonceux Castle, about 70 km south-southeast of Greenwich in East Sussex, to avoid the pollution in London. The scientific staff moved there upon the completion of the new observatory buildings in 1957. The Isaac Newton Telescope was built in Herstmonceux in 1967. However, it was then moved to Roque de los Muchachos Observatory in the Canary Islands in 1979. In 1990, the Royal Greenwich Observatory moved again, to Cambridge. When it closed in 1998, Her Majesty's Nautical Almanac Office moved into the Rutherford Appleton Laboratory while other departments went to the UK Astronomy Technology Centre in Edinburgh. Herstmonceux Castle now houses the International Study Centre of Queen's University, Kingston, Canada and the Observatory Science Centre.
Today the Royal Observatory buildings include a museum of astronomical and navigational tools, which is part of the National Maritime Museum, and John Harrison's prize-winning longitude marine chronometer, among others. It is also home to the 28-inch Grubb refracting telescope, the largest telescope of its kind in the UK.
In February 2005 construction work began on a £15 million redevelopment project. It was completed on 25 May, 2007, to add the 120 seat Peter Harrison Planetarium and additional display galleries and educational facilities to the Royal Observatory.
External Link
Official website of the Royal Observatory, Greenwich
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Royal Observatory, Greenwich, 
