This sundial served the important monastery at Bangor. Though damaged, it is a survival from the late Early Christian period, probably the tenth to twelfth centuries. Three main rays indicated the main daytime services at the third sixth and ninth hours but only the noon (sixth hour) ray is now clear. An early sundail has been reconstructed at Nendrum, Mahee Island, Co. Down, and a third can be seen at Clogher Cathedral, County Tyrone.

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