This year's solstice is special as it will be followed the next day by the year's last full moon, called the Cold Moon, and the Ursid meteor shower.
The winter solstice in 2018 will occur at 10.23pm in London, at this time the sun will be directly overhead of the Tropic of Capricorn in the Southern Hemisphere.
December's full moon is also called the Long Night's Moon because it typically occurs near the winter solstice, the shortest day of the year.
The winter solstice, also known as midwinter, is a phenomena that occurs when one of the Earth's poles has its maximum tilt away from the Sun.
The long December nights bring crystal clear skies to the Northern Hemisphere, allowing the Cold Moon to glow brightly in the night sky.
For those in the North of the Arctic Circle towards the North Pole, 21 December and the winter solstice marks results in a polar night as there will be no daylight on this day.
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The upside is that after the winter solstice, daylight hours will become longer - eventually. The sun would be at its lowest position throughout the Northern Hemisphere sky.
The American Meteor Society says the Ursids should be visible in the mid-Northern Hemisphere.
A full moon will appear tonight. Crowds selected by lottery wait for a chance to see the sunrise light up the ancient passage tomb.
At the Stonehenge in United Kingdom, people come together to capture the moment when the sun aligns with the rocks at sunrise and sunset.
Every full moon has a different name depending on what time of year it falls. While locals enjoy rice balls meaning "family reunion".
However, most people concentrate on the whole solstice day, which has been recognised by holidays and festivals in many cultures all over the world.