This
could be where the world begins, or ends; depending
on your view. It is where the prime meridian was established
and runs from there to the north and south poles.
The red ball on top of the building signifies Greenwich
Mean Time, and every day at exactly 1:00pm, it falls
from the top of the spire to the bottom. You can also
stand with one foot in the eastern and one foot in
the western hemisphere, if you like. Sailors in the
Thames have set their watches and clocks by it since
1883. The current Royal Naval Observatory is now in
Sussex
