File:Trig Point, Pole Hill, Chingford, London E4 - geograph.org.uk - 1053624.jpg
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English: Trig Point, Pole Hill, Chingford, London E4. Looking south beyond the trig point we can see the London skyline.
At the top of Pole Hill a pillar 1053632 was erected in 1824 under the direction of the Reverend John Pond, MA, Astronomer Royal. It was placed on the Greenwich Meridian and its purpose was to indicate the direction of true north from the transit telescope of the Royal Observatory. The Greenwich Meridian was changed in 1850 and adopted by international agreement in 1884 as the line of zero longitude passes 19 feet to the east of this pillar. At that point (19 feet / 5.8m east) there is a smaller concrete obelisk, as shown in the above image, which marks the true modern position of the Greenwich Meridian. The pillar however was not erected to mark the meridian. It is an Ordnance Survey trig point placed here to mark the top of the hill. The fact that it is on or near the Meridian is a coincidence. |
| Date | |
| Source | From geograph.org.uk |
| Author | Christine Matthews |
| Attribution (required by the license) | Christine Matthews / Trig Point, Pole Hill, Chingford, London E4 / |
| Camera location |   | View this and other nearby images on: OpenStreetMap |  |
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| Object location | | View this and other nearby images on: OpenStreetMap | |
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This image was taken from the Geograph project collection. See this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by Christine Matthews and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: Christine Matthews
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:15, 24 February 2011 | | 436 × 640 (112 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=Trig Point, Pole Hill, Chingford, London E4 Looking south beyond the trig point we can see the London skyline. At the top of Pole Hill a pillar [1053632] was erected in 1824 under the directi |
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