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On the sign:
The Greenwich Meridian Telescope Behind the window is the telescope which defines the Greenwich Meridian. It is a transit circle designed by the 7th Astronomer Royal, George Airy, in 1850. It was the centre-line of this instrument that was adopted by an international conference in Washington, USA, in 1884 as the Prime Meridian for the World, or longitude 00° 00’ 00". Both time and longitude are measured from this line.
The telescope was photographed on the same day (the longitude can be seen on top of the window, both in the photo taken from the inside and the one outside) Click for a larger image Click for a larger image
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