File:Blackwall, Virginia Quay and the Greenwich Meridian - geograph.org.uk - 789437.jpg

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https://commons.wikimedia.org/wiki/File:Blackwall,_Virginia_Quay_and_the_Greenwich_Meridian_-_geograph.org.uk_-_789437.jpg

Description English: Blackwall: Virginia Quay and the Greenwich Meridian The line down the middle of the avenue represents the Greenwich Meridian, and carries on up the building in the distance. Incidentally don't take your GPS receiver to this line and expect it to read 0˚ 00' 00".00000 W longitude! This is because the GPS system uses World Geodetic System 1984 (WGS84) longitudes which are defined, simply, in terms of the geometric centre of the Earth, whereas the Greenwich Meridian is defined in terms of the gravitational centre of the Earth, which is slightly different. 0˚ 00' 00".00000 W longitude on your GPS should appear about 100 metres east of this location, near the Virginia Quay memorial, whereas you should read about 0˚ 00' 05".7 W longitude here on this line. As an aside (!) this is the Barratt-built Virginia Quay housing development. Date	1 May 2008 Source	From geograph.org.uk Author	Nigel Cox Attribution (required by the license)	Nigel Cox / Blackwall: Virginia Quay and the Greenwich Meridian / CC BY-SA 2.0 Camera location	51° 30′ 28″ N, 0° 00′ 07″ W Heading=0° Kartographer map based on OpenStreetMap. View this and other nearby images on: OpenStreetMap - Google Earth	info Object location	51° 30′ 28″ N, 0° 00′ 07″ W Heading=0° Kartographer map based on OpenStreetMap. View this and other nearby images on: OpenStreetMap - Google Earth	info Licensing Geograph depth small.png	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 Nigel Cox and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license. w:en:Creative Commons attribution share alike

This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license. Attribution: Nigel Cox