Canary Wharf Tower 2
 

Home
Music Transcriptions
Minute a Day Music
Music and Book Store
Celtic Music
Orchestral Instruments
Instruments for Sale
Acoustics
Music of Birds
The Charm of Birds
Bird photos and videos
Animal photos and videos
London Sights and Sounds
Roads and Sights of England
Sights and Sounds of Texas
Music History - December
Contents
Contact
Useful Links
Privacy Policy

Index of London pages

View from the top of Canary Wharf Tower.
From the West to the South 


You may need to click the play arrow twice.
Be a little patient!
If you are on dial-up connection, it may take a while to load.

Back to Index of London pages

 

The Greenwich Meridian

Unlike the parallels of latitude, which are defined by the rotational axis of the Earth (the poles being 90 and the Equator, 0), the prime meridian is arbitrary, and multiple meridians have been used through history as the prime meridians of various mapmaking systems (including four different Greenwich meridians). The Greenwich Meridian established by Sir George Airy in 1851 was agreed upon as the international standard in October 1884. The zero meridian used by the Ordnance Survey is about six meters to the west of the line marked at Greenwich. The Greenwich Meridian is now marked at night by a laser beam emitted from the observatory.