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Time ball
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A time ball is a large, wooden or metal ball that moves up and down a pole, and which is dropped at a predetermined time of day. Because precise timekeeping is essential to the determination of longit
A time ball, installed in 1833, atop the Octagon Room at the Royal Observatory, Greenwich, London
A time ball, installed in 1833, atop the Octagon Room at the Royal Observatory, Greenwich, London
The Boston Time Ball (1881)
The Boston Time Ball (1881)
Sydney Observatory with time ball
Sydney Observatory with time ball
The time ball at Port Lyttelton, New Zealand, started signalling Greenwich Mean Time to ships in the harbour beginning in 1876. The Lyttelton Timeball
The time ball at Port Lyttelton, New Zealand, started signalling Greenwich Mean Time to ships in the harbour beginning in 1876. The Lyttelton Timeball Station was destroyed by an earthquake in 2011 but was rebuilt and reopened in 2018.
Royal Observatory, Greenwich
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The Royal Observatory, Greenwich is an observatory situated on a hill in Greenwich Park in south east London, overlooking the River Thames to the north. It played a major role in the history of astron
The Airy Transit Circle at the Royal Observatory, Greenwich, used for over a century (1851–1953) as the reference point when charting the heavens and determining times, thus earning for it the epithet "the centre of time and space"
The Airy Transit Circle at the Royal Observatory, Greenwich, used for over a century (1851–1953) as the reference point when charting the heavens and
The building housing the origin of the Greenwich Prime Meridian, marked by the brass strip in the foreground. The apex of the roof opens up to the lef
The building housing the origin of the Greenwich Prime Meridian, marked by the brass strip in the foreground. The apex of the roof opens up to the left above the white vertical strips (joints in the eaves are visible), enabling telescopic star sightings to be made.
The Shepherd Gate Clock at the gates of the Royal Greenwich Observatory. This clock shows Greenwich Mean Time all year round, ie. it is not set to Bri
The Shepherd Gate Clock at the gates of the Royal Greenwich Observatory. This clock shows Greenwich Mean Time all year round, ie. it is not set to British Summer Time in the summer.