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A time ball or timeball is a time-signalling device. It consists of a large, painted wooden or metal ball that is dropped at a predetermined time, principally to enable navigators aboard ships offshore to verify the setting of their
marine chronometer A marine chronometer is a precision timepiece A clock is a device used to measure, verify, keep, and indicate time Time is the indefinite continued sequence, progress of existence and event (philosophy), events that occur in an app ...
s. Accurate timekeeping is essential to the determination of longitude at sea. Although the use of time balls has been replaced by electronic time signals, some time balls have remained operational as historical tourist attractions.


History

The fall of a little ball was in antiquity a way to show to people the time. Ancient Greek clocks had this system in the main square of a city, as in the city of Gaza City, Gaza in the post-Alexander era, and as described by Procopius in his book on Edifices. Time ball stations set their clocks according to transit observations of the positions of the sun and stars. Originally they either had to be stationed at the observatory, or had to keep a very accurate clock at the station which was set manually to observatory time. Following the introduction of the electric Telegraphy, telegraph around 1850, time balls could be located at a distance from their source of Local mean time, mean time and operated remotely. The first time ball was erected at Portsmouth, England, in 1829 by its inventor Robert Wauchope (Royal Navy officer), Robert Wauchope, a captain in the Royal Navy. Others followed in the major ports of the United Kingdom (including Liverpool) and around the maritime world. One was installed in 1833 at the Royal Observatory, Greenwich, Greenwich Observatory in London by the Astronomer Royal, John Pond, originally to enable tall ships in the Thames to set their marine chronometers, and the time ball has dropped at 1 p.m. every day since then. Wauchope submitted his scheme to American and French ambassadors when they visited England. The United States Naval Observatory was established in Washington, D.C., and the first American time ball went into service in 1845. Time balls were usually dropped at 1 p.m. (although in the United States they were dropped at noon). They were raised half way about 5 minutes earlier to alert the ships, then with 2–3 minutes to go they were raised the whole way. The time was recorded when the ball began descending, not when it reached the bottom. With the commencement of Time signal, radio time signals (in Britain from 1924), time balls gradually became obsolete and many were demolished in the 1920s. A contemporary version of the concept has been used since 31 December 1907 at New York City's Times Square as part of its New Year's Eve celebrations; at 11:59 p.m., a Times Square Ball, lit ball is lowered down a pole atop the One Times Square tower over the course of sixty seconds, concluding at midnight. For the arrival of 1988, the event's organizers acknowledged the addition of a leap second by extending the drop to 61 seconds (in reality, the leap second was applied worldwide five hours earlier at midnight Coordinated Universal Time, UTC). The spectacle was inspired by an organizer having seen the time ball on the Western Union Telegraph Building, Western Union Building in operation.


Around the world

Today there are over sixty time balls standing, though many of these are no longer operational. Existing time balls include the following:


Australia

* The Old Windmill, Brisbane, Queensland * Fremantle, Western Australia * Sydney Observatory, New South Wales * Newcastle Customs House, New South Wales * Semaphore, South Australia, Semaphore, South Australia * Williamstown Lighthouse, Victoria (Australia), Victoria


Canada

* Citadelle of Quebec, Quebec City


New Zealand

In March 1864 New Zealand's first time ball was established at Wellington. This was followed by Port Chalmers in June 1867, Wanganui in October 1874, Lyttelton in December 1876 and Timaru in 1888. Attempts were made by some people in Auckland to establish time balls there from 1864 onwards, but these were not recognized by the authorities until a permanent time ball was mounted on the Auckland Ferry Terminal, Ferry Building in August 1901. * Port Chalmers :Established by the Otago Provincial Council on top of Observation Point in Port Chalmers in June 1867 the Port Chalmers time ball , time ball service initially operated at 1 pm on all days of the week except Sundays. The service was discontinued in October 1877, but following concerns raised by 11 shipmasters the service resumed in April 1882 as a weekly service. In 1910 the time keeping service was discontinued but the ball however continued to be used until 1931 as a warning device. It was removed in 1970 but a replacement was restored to service in 2020. * Lyttelton :Established in December 1876 the Lyttelton Timeball Station in Lyttelton, New Zealand, was operational until it was damaged in the 2010 Canterbury earthquake. Further severe damage occurred in the February 2011 Christchurch earthquake, and a decision was made in March 2011 to dismantle the building, a danger to the public, but the tower collapsed during the June 2011 Christchurch earthquake, major aftershock that hit the Lyttelton area on 13 June 2011. In November 2012, a large financial donation was made available to contribute towards rebuilding the tower, a project the community considered. On 25 May 2013, it was announced that the tower and ball would be restored, and that funds were to be sought from the community to rebuild the rest of the station. The station was officially reopened on 2 November 2018. * Wellington :The Wellington time ball service started in March 1864. It received its time information from the Dominion Observatory, Wellington, Dominion Observatory which was also communicated to the Lyttelton time ball service. Dunedin used local observatory facilities. :Wellington had two time ball sites – the time ball was erected at the first site by mid-January 1864 on top of the Custom House building on the Wellington waterfront and later relocated in 1888 to the J Shed Woolstore on top of the Hydraulic accumulator, accumulator tower. This building and the time ball burnt down on 9 March 1909. :Instead of replacing the Wellington time ball after the second site burnt down, time light signals were introduced at the Dominion Observatory, Wellington, Dominion Observatory. The earliest record of this was 22 February 1912. They were in use until 1937 when wireless signals took over as the new way to keep time.


Poland

* Gdańsk, Poland (The time ball was installed in 1876, moved to the Danzig (now Gdańsk) lighthouse in 1894, and removed in 1929. In 2008 it was reconstructed from original plans)


South Africa

* Victoria & Alfred Waterfront, Cape Town


Spain

* The Real Instituto y Observatorio de la Armada in San Fernando, Cádiz keeps activating its time ball every day at 13:00 (ROA Time). After better timekeeping at sea made it obsolete, it was disabled, but it was reactivated in the late 20th century. * The Royal House of the Post Office in Puerta del Sol, Madrid, operated a time ball for Madrid. Nowadays it is only used to mark the imminent start of the bell strikes that mark the New Year at midnight. The main Spanish TV networks broadcast the event, allowing spectators to eat the traditional Twelve Grapes.


United Kingdom

* Deal Timeball, Deal, Kent, England * Margate Clock Tower, Kent, England * Royal Observatory, Greenwich, England * Time Ball Buildings, Leeds, England * Guildhall, Kingston upon Hull, England. The only maritime timepiece on a municipal building. It dates back to 1918 and is the highest in the UK. * Clock Tower, Brighton, East Sussex, England. (originally operated hourly, but was later stopped as it was too noisy) * Nelson Monument, Edinburgh, Nelson's Monument on Calton Hill, Edinburgh, Scotland


United States

* United States Naval Observatory, Washington D.C. * Titanic Memorial (New York City), Titanic Memorial, New York City * Plymouth Light, Gurnet Point, Plymouth, Massachusetts


Gallery

File:Nelson Monument.jpg, Nelson Monument, Edinburgh, The Nelson Monument, Edinburgh, UK File:US Naval Observatory (Washington, District of Columbia).jpg, United States Naval Observatory, Washington, D.C., US File:Deal Timeball Tower.jpg, Deal Timeball, Deal, Kent, Deal, UK File:Nowy Port Gdansk-kula czasu latarnia.png, Gdańsk, Poland File:Time ball on Navigationsskolan Gbg.jpg, Gothenburg, Sweden File:Guildhall Clock Tower - geograph.org.uk - 241097.jpg, Guildhall, Kingston upon Hull, Guildhall, Kingston upon Hull, UK File:Madrid - Puerta del Sol 01.JPG, Royal House of the Post Office, Madrid, Spain File:MARGATE CLOCK TOWER AND TIME BALL.jpg, Clock tower, Margate, Kent, UK File:Brighton_Clock_Tower.jpg, Clock Tower, Brighton, Clock tower, Brighton, UK File:Time_Ball_Tower_13.jpg, Time Ball, Cape Town, South Africa File:Fort_Gellibrand.jpg, Time Ball, Williamstown Lighthouse, Victoria (Australia), Victoria, Australia


See also

* Blackhead Point, in Hong Kong, where a time ball was operated from 1908 to 1933 * History of longitude * Shepherd Gate Clock * Time signal * Weather ball * Greenwich Mean Time (GMT)


References


External links

*{{Cite book , contribution=List of Timeballs , title=Index to the House Documents, Otherwise Publ. as Executive Documents , publisher=U.S. Congress , year=1876–1877 , pages=305–308 , url=https://books.google.com/books?id=JJ8FAAAAQAAJ&q=%22time+ball%22&pg=PA305 List of time balls worldwide in 1876.
Time ball/cannon hobbyistTime ball and cannon Association
Navigational equipment Horology Time balls,