Winter solstice on Google doodle: It is the shortest day of the year and the longest night of the year. This is a minor meteor shower, so people should only expect to see a few shooting stars per hour.
In the Southern Hemisphere, the seasons are reversed and 21 December is their summer solstice meaning it is the day with the most amount of daylight.
The winter solstice - when the Earth's titled axis is facing its farthest from the sun in the Northern Hemisphere - happens at 3:23 p.m. Friday and marks the start of winter.
Every full moon has a different name depending on what time of year it falls. The phenomenon occurs when one of the Earth's poles has its maximum tilt away from the Sun. Due to the moon's coinciding with the Ursid meteors, the best time to see the shower will be the evening of December 20 or December 21, the longest day of the year.
The Ursids meteor shower should be visible in the mid-Northern Hemisphere, according to the American Meteor Society.
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If the weather obscures the sky and blocks out the moon on the night that it is full, onlookers can head outside and look to the sky the night before or the night after as it will still appear to be full.
A solstice is when the sun either reaches the highest or lowest point in the sky depending on where you are in the world.
In Ireland, people gather days before the solstice at Newgrange - a massive gravesite that's more than 5,000 years old.
At the Stonehenge in United Kingdom, people come together to capture the moment when the sun aligns with the rocks at sunrise and sunset.
At Stonehenge, people come together to celebrate and capture the moment when the sun directly aligns with the famous stones. The treat is said to bring prosperity and unity.