Armilllary Dial - Royal Observatory - Greenwich, UK
Posted by: 
BruceS
N 51° 28.660 W 000° 00.077
30U E 708229 N 5707210
Armillary dial on the grounds of the Royal Observatory in Greenwich, London, UK.
Waymark Code: WMA1QK
Location: London, United Kingdom
Date Posted: 11/01/2010
Views: 22
Text of information sign:
Armillary dial
Sundials are the oldest known device for telling the time. As the Earth rotates and the Sun appears to move across the sky, the shadow cast on the scale indicates the time of day.
This dial constructed in 1968, represents a globe made from a series of rings. The rings are called armillae in Latin, so is called an armillary dial. The hour scale is on the northern half of the ring representing the equator.