That is because at the solstice, Earth's tilt means that the "terminator" - the line dividing day and night that can be seen in pictures taken from space - crosses the country diagonally.
Get ready for the winter solstice, signifying the start of winter and the shortest day of the year.
"Culturally, the solstices and equinoxes are typically used to denote either the beginnings of the seasons or the center points of the seasons..."
Although the winter solstice is associated with lower temperatures, December 21 will not be the coldest day of 2017.
So the December 21 solstice falls in the middle of their summer, while the June solstice is their winter.
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The solstice occurs at 11:28 a.m., the moment the North Pole is tilted the farthest from the sun and the South Pole tilted most toward it.
The live stream will begin at 8.30am (We'll share the link in a post to our facebook page at 8.20am) and this year marks a very special anniversary too.
Although the weather will remain cold and harsh, at least you'll get a little more daylight every day. The summer solstice is when the sun's rays are directly over the Tropic of Cancer. During the other half of the year, between September and March, the south pole is pointing toward the sun, with the solstice marking the midway point of this journey.
It would make sense that the shortest day of the year would also be the coldest, but that's actually a bit of a misnomer.
Is the solstice on the same day every year?
Welcoming the initiative, Minister of State for Tourism and sport, Brendan Griffin TD said: "This is a fantastic way to share the unique magic of Newgrange with a much larger audience". This will give us our longest day.