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Sign: London - Greenwich - Greenwich Meridian Marker 1750-1851


Address:
Royal Observatory, Blackheath Ave, London SE10 8XJ, UK
Category:
Monuments and History
City:
London For all manhole covers in London
Country:
United Kingdom For all manhole covers in United Kingdom
Shape:
Rectangle
Material:
Metal
Placement:
Wall or fence
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Map Route Route No loc. Around me
On the sign:
Greenwich Meridian Marker 1750-1851
This pillar was built in 1798 to help astronomers align the Observatory’s meridian telescope in the building behind you. This telescope defined what was then the Greenwich Meridian established in 1750 and was kept accurately positioned by sighting a metal marker on the top of the pillar. In1851 George Airy, 7th Astronomer Royal, installed a new telescope and move the Greenwich Meridian a little to the east, to its current position. Between 1920 and 1950 this pillar was used as a support for a night-sky camera.
Photography:
2023
Eli Zvuluny
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Comments:
The marker was photographed on the same day Click for a larger image

The royal observatory "in whose honor" the longitude was defined, and mentioned on the sign was photographed on the same day Click for a larger image

The current location of longitude 0, appears on another sign Click for sign's details


The signs closest to the current sign (Click to show or hide) Mesh (mosaic) Signs around me

London - Greenwich - Panoramic view from the Royal Observatory
Royal Observatory, Blackheath Ave, London SE10 8XJ, UK (5 Meter)
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Royal Observatory, Blackheath Ave, London SE10 8XJ, UK (6 Meter)
London - Greenwich - Gate clock mechanism
Royal Observatory, Blackheath Ave, London SE10 8XJ, UK (19 Meter)
London - Greenwich - standards of length and height
Royal Observatory, Blackheath Ave, London SE10 8XJ, UK (21 Meter)
London - Greenwich - The Shepherd 24-hour Gate Clock and The Time Ball
Royal Observatory, Blackheath Ave, London SE10 8XJ, UK (21 Meter)
London - Greenwich - The Dedication Plaque of Flamsteed House
Flamsteed House and Harrison’s Sea Clocks, The Avenue, London SE10 8XJ, UK (25 Meter)

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