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Meridian circle
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The meridian circle is an instrument for timing of the passage of stars across the local meridian, an event known as a culmination, while at the same time measuring their angular distance from the nad
Groombridge transit circle of 1806
Groombridge transit circle of 1806
Meridian circle at Saint Petersburg Kunstkamera, built by T.L. Ertel, Germany, 1828
Meridian circle at Saint Petersburg Kunstkamera, built by T.L. Ertel, Germany, 1828
Meridian circle at the Kuffner observatory, Vienna, Austria, built by Repsold & Sons, Hamburg, 1886. Note the counterweights, the short, green cylindr
Meridian circle at the Kuffner observatory, Vienna, Austria, built by Repsold & Sons, Hamburg, 1886. Note the counterweights, the short, green cylindrical objects at the outer top of the mechanism, and the four long, thin, microscopes for reading the circles.
Meridian circle at the Quito Astronomical Observatory. Built by Repsold & Sons, Hamburg, 1889.
Meridian circle at the Quito Astronomical Observatory. Built by Repsold & Sons, Hamburg, 1889.
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
Meridian circle
…observatories of Harvard College, Cambridge University and Edinburgh University had large circles by Troughton and Simms. The Airy Transit Circles at the Royal Greenwich Observatory (1851) and that at the Royal Observatory, Cape of Good Hope (1855) were made by Ransomes and May of Ipswich. The Greenwich instrument had optical and…
Royal Observatory, Greenwich. A time ball sits atop the Octagon Room.
Royal Observatory, Greenwich. A time ball sits atop the Octagon Room.
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 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 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.