The Winter Solstice is an astronomical phenomenon that marks the shortest day and the longest night of the year. In the Northern Hemisphere, the Winter Solstice occurs on 21 or 22 December, when the sun shines directly over the tropic of Capricorn. At sunrise on the shortest day of the year, for 17 minutes, direct sunlight can enter the Newgrange monument, not through the doorway, but through the specially contrived small opening above the entrance known as the ‘roof box’, to illuminate the Chamber.
Newgrange is best known for the illumination of its passage and chamber by the rising sun at the Winter Solstice. Above the entrance to the passage of the mound there is a opening called a roof-box. On mornings around the winter solstice a beam of light penetrates the roof-box and travels up the 19m (62ft) passage and into the chamber. As the sun rises higher, the beam widens so that the whole chamber is dramatically illuminated.
“Warning: Eruption has started north of Grindavik by Hagafell,” the Met Office said on its website.
Reykjanes is a volcanic and seismic hot-spot southwest of the capital Reykjavik.