, In rare occasions where the ball could get stuck due to icing or snow, and if the wind was too high it would not be dropped. , In the early 19th century, the main positional devices were the Troughton Transit instrument and a mural circle, but after George Biddell Airy took over as Astronomer Royal in 1835, he embarked on a plan to have better instruments at Greenwich observatory. The observatory buildings at Greenwich became a museum of astronomical and navigational tools, which is part of the Royal Museums Greenwich. When Greenwich was an active observatory, geographical coordinates were referred to a local oblate spheroid called a datum known as a geoid, whose surface closely matched local mean sea level. Tickets to the Meridian Line and Historic Royal Observatory also includes admission to our Time galleries and Great Equatorial Telescope.  At Herstmonceux, the castle grounds became the home of the International Study Centre of Queen's University, Kingston, Canada and The Observatory Science Centre, which is operated by an educational charity Science Project. Wilkins", "The Observatory Science Centre on eHive", "Observatory Science Centre – Brighton & Hove days out", "Time's up for the Greenwich observatory", "Star attraction: Royal Observatory seeks volunteers to use new telescope", "First Light: a new era for the Royal Observatory", "New telescope for Royal Observatory Greenwich", "Royal Museums Greenwich : Sea, Ships, Time and the Stars : RMG", "Royal observatory could return to Greenwich site", "Press Release: Reopening of the new Royal Observatory, Greenwich", "National Maritime Museum Annual Report and Accounts 2016-2017", Online catalogue of the Royal Greenwich Observatory Archives (held at Cambridge University Library), "Where the Earth's surface begins—and ends", Aerial View of The Royal Observatory, Greenwich at Google Maps, Castle in the sky – The story of the Royal Greenwich Observatory at Herstmonceux, Map of the Royal Greenwich Observatory at Herstmonceux, A Personal History of the Royal Greenwich Observatory at Herstmonceux 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The red time ball on the eastern turret was installed in 1833 and is dropped daily at 1pm as a signal of the time to boats on the Thames. 1675 – 22 June, Royal Observatory founded. The Observatory was officially known as the Royal Greenwich Observatory, Herstmonceux.  Bradley was the third Astronomer Royal, and his tenure started in 1742.  The instrument can be used to plot the locations of stars, or alternately, with an accurate star chart, the time at the location of the instrument..  Besides the change of the reference line, imperfections of the surveying system added another discrepancy to the definition of the origin, so that the Bradley line itself is now 0°00'00.12" East of the Ordnance Survey Zero Meridian (about 2.3m).
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