This occurs when Earth's North Poles has its maximum tilt away from the Sun.
Soon after the winter solstice, the number of daylight hours in the Northern Hemisphere will gradually grow longer each day until the summer solstice in late June, when the greatest amount of daylight hours occurs. On the other hand, the winter solstice also marks the longest day of in the Southern Hemisphere.
Winter Solstice marks the shortest day of the year, with Brits only getting 7 hours and 49 minutes of daylight before the evenings and mornings begin to lengthen once more.
Typically around Dec. 21 or 22 - though on rare occasions, it can be as early as Dec. 20 or as late as Dec. 23 - the sun is directly overhead at the Tropic of Capricorn (23.5 degrees south latitude).
But that means it looks full Friday night and Saturday night.
The long December nights bring crystal clear skies to the Northern Hemisphere, allowing the Cold Moon to glow brightly in the night sky.
The number of daylight hours peaks at summer solstice - in the United Kingdom, summer solstice sees 16 hours, 38 minutes and 19 seconds of daylight to be enjoyed. Because of this year's overlap, NASA's meteor expert Bill Cooke dubbed the meteor shower the "Cursed Ursids".
People around the world have celebrated this astronomical milestone for centuries.
This year's meteor viewing may be a bit more difficult with a full moon because light pollution from the moon makes it harder to see those meteors, but it sounds like the meteor shower should be active enough for a few to be visible.
In Ireland, people gather at Newgrange, a massive 5,000 years old gravesite, to witness the sunrise lighting up the ancient tomb.
At Stonehenge, people come together to celebrate and capture the moment when the sun directly aligns with the famous stones.
Winter Solstice in China is referred to as the Dongzhi Festival. It's really a case of "Sunny side down" for the Earth today!
Richard Wilkins , Georgie Gardner and Karl Stefanovic attend the 2019 Nine Upfronts on October 17, 2018 in Sydney, Australia. He tied the knot with his new wife just days ago in a luxury Mexico wedding, before jetting off on honeymoon together.
James Mattis is to step down as defense secretary, leaving the White House in protest at Donald Trump's approach to world affairs. Trump's announcement of a troop withdrawal from Syria was at odds with many of his own military officials.
Sony Pictures and Marvel Studios shared some brand new information on their highly-anticipated sequel, Spider-Man: Far From Home. The third DLC chapter, Silver Lining finds Silver Sable has stormed back to reclaim her stolen Sable International tech.
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There's also the possibility that the USA and Turkey may find themselves at cross-purposes over the American offer . The S-400 is a major sticking point in the military relationship between the US and Turkey.
But the message was received, and Flynn's lawyers, having read the room, asked for the sentencing to be postponed until March. Flynn also admitted that he was aware that lying to the Federal Bureau of Investigation was a crime when he did it.
The bureau has forecast highs of 32C on Thursday, before it soars to 36C on Friday and an uncomfortable 39C on Saturday. For weeks, you've asked our weather team: Will Dec. 25 be a winter wonderland or will our lawns look sad?
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