The sun sets on 24 December at 3.55pm in the UK, and rises the following morning at 8.05am.
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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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Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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Nearly 60 million Christmas trees are grown each year in Europe.
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The tradition of putting tangerines in stockings comes from 12th-century French nuns who left socks full of fruit, nuts and tangerines at the houses of the poor.
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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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The poinsettia is a traditional Christmas flower. In Mexico (its original birthplace), the poinsettia is known as the "Flower of the Holy Night".
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The abbreviation Xmas isn't irreligious. The letter X is a Greek abbreviation for Christ.
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