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Sundial (inside red circle) in the ruins of Teampall Ċiaráin on Inishmore, the largest of the Aran Islands off the coast of Galway. It is believed that St. Ciaráin founded a monastery on this site in the 6th Century when he was studying on Aran with St.Enda. The current remains of a rectangular medieval stone church may date from the 8th Century |
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The ancient vertical stone 'noon line' sundial at Teampall Ċiaráin is 1200mm high, 375mm wide, 75mm thick. It has a cross decoration below the vertical noon line which is inscribed within a circle. Nothing remains of the gnomon (the shadow caster) but a 50mm diameter hole where a wood or metal horizontal gnomon would have been fitted. On any day, when the sun is due south and at its highest in the sky, the shadow of the gnomon lies in the vertical grove at mid-day, twelve noon, marking the passing of the first half of the day |