Home
Interactive UK map
Interactive World map
Visit
 
Royal Observatory Greenwich
Latitude and Longitude
Airy Transit Circle (ATC)
WGS84 and the Greenwich Meridian
The Greenwich Meridian before the ATC
The Quest for Longitude
International Meridian Conference (1884)
Meridian Day (1984)
The Millennium
Millennium Tree Line (MTL)
Meridian Laser
Astronomers Royal
Telescopes used with Meridian Marks
 
Coordinate Systems
Useful Links
 
Search
LocationEngland
Hertfordshire
Westmill
W side of: A10
Distance (N) from Greenwich
OS map detailsOS Explorer: 194
OS grid refTL 37520.27016
(537520,227016)
WGS84 lat/long51.924685, -0.001536
TypeBollard
Marking date1984
AccessUnrestricted