The sun sets on 24 December at 3.55pm in the UK, and rises the following morning at 8.05am.
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US scientists calculated that Santa would have to visit 822 homes a second to deliver all the world's presents on Christmas Eve, travelling at 650 miles a second.
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Many theologians estimate that Jesus wasn't born on December 25 but sometime in September between 6BC and 30AD.
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'Klaxon' is a name that does not belong to one of Santa's reindeer. A klaxon is actually a powerful electric horn. Its name comes from a German word meaning "shriek".
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Frumenty was a spiced porridge, enjoyed by both rich and poor. It was a forerunner of modern Christmas puddings. It is linked in legend to the Celtic god Dagda, who stirred a porridge made up of all the good things of the earth.
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7.6 million Christmas trees are sold each year.
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The Christmas tree displayed in Trafalgar square in London is an annual gift to the UK from Norway since 1947. The Norwegian spruce given is a token of appreciation of British friendship during World War II from the Norwegian people.
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