Crowds gathered at Newgrange in Co Meath this morning for the Winter Solstice - the astronomical phenomenon that marks the shortest day and the longest night of the year.
In clear conditions, light from the rising sun lights up the inner chamber of the 5,000-year-old tomb.
However a damp and cloudy start meant it remained in darkness today.
#WinterSolstice celebrations continuing at Newgrange. But a murky morning meant no rising sun to light up the 5000-year-old chamber. pic.twitter.com/CAVcuNC4aD— Philip Bromwell (@philipbromwell) December 21, 2018
In the Northern Hemisphere, the winter solstice occurs on either 21 or 22 December, when the sun shines directly over the tropic of Capricorn.
Sunrise on the shortest days of the year begins at 8.56am and the light shines into the Newgrange chamber for 17 minutes.
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The Office of Public Works opens the monument for the dawn from 18 December to 23 December.
By Sunday, 60 people - including visitors from as far afield as Australia, Brazil and Canada - will have had access to the chamber.
Winter Solstice and the Miracle of Newgrange— RTÉ Archives (@RTEArchives) December 21, 2018
WATCH: @RTENews reports #OnThisDay 1986 #WinterSolstice https://t.co/0b9UCrgdBX