The Royal Observatory in London

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The home of Greenwich Mean Time and the Prime Meridian line, this is one of the most important historic scientific sites in the world. It was founded by Charles II in 1675 and is, by international decree, the official starting point for each new day, year and millennium (at the stroke of midnight GMT as measured from the Prime Meridian). Now a detached part of the National Maritime Museum, it houses a museum and planetarium.
Price: 7£, planetarium shows £2-4
Hours: 10AM-5PM, closed 24-26 Dec
Address: Flamsteed House
Directions: In middle of Greenwich Park
Phone: +44 20 8858 4422
Url: http://www.nmm.ac.uk/places/royal-observatory

Source wikitravel.org/en/London/Greenwich