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Sign: London - Greenwich - Armillary dial

38-Inch Telescope Dome, London SE10 8XJ, UK
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On the 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 it is called an armillary dial.
The hour scale is on the northern half of the ring representing the equator.

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The dial is in the Meridian Garden, a place where various historical measuring and observation instruments are concentrated.

Armilla in Latin means circle

The dial was taken on the same day Click for a larger image

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