Monument stands near the top of Calton Hill. Here it can be seen
with Queen's Park - Arthrur's Seat and Salisbury Crags - in the
monument is in the shape of an upturned telescope. It has a white
circular 'time ball' which is raised shortly before 1pm and lowered at
1pm, originally to allow the shipping in the Forth to check the time of
One o' Clock Gun at Edinburgh Castle is now fired at 1pm to signal the
time. For a period in the 19th century the Time Ball was likned by
an overhead wire stretching across Waverley Valley to the Overhead
Gun, so that the lowering of the time ball automatically fired the gun.
photographer and astronomer, Charles Piazzi Smith was responsible for
making these arrangements.