دونور
دونور
دونور
دونور
Above the entrance to the passage at Newgrange there is an opening called a roof-box. Its purpose is to allow sunlight to penetrate the passage and chamber at sunrise around the Winter Solstice. At 8:58am a narrow beam of light penetrates the roof-box and reaches the floor of the chamber, gradually extending to the rear of the passage. As the sun rises higher, the beam widens within the chamber so that the whole room becomes dramatically illuminated. After 17 minutes the sunbeam leaves the chamber and retreats back down the passage.

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